Question external display

Similar Questions

• External display on HDMI overheating my Mac and drains the battery badly

  Hey guys.

  I am using a MBP retina 2012 15 inches with an external monitor, a generic LCD 1080 p via HDMI without problems. And recently updated for Sierra.

  The question starts immediately when I plug it into the screen. The Macbook seems to overheat and run fans above 4000 rpm, which is very audible and boring. CPU and GPU temperatures go above 70 degrees C (normally they make 50 +). The battery holds for only 1.5 hours, generally works well for 4-5 hours.
  I tried killing all apps, followed a bad process in activity monitor, changing default resolution - nothing helps so far. The CPU is barely used by 10%, the memory pressure is fine.
  It's just that time when I plug the screen - Mac starts bad feeling. Never, the problem occurred on El Capitan. Maybe it's a GPU problem, but certainly caused by the OS.
  All the world had the same problem?

  Try resetting the NVRAM (hold down the command-option-P-R on startup).

  Also, try to restart in Mode without failure, then normally again.

  Finally, try logging into your account, sign in to a user account (or the guest account) and connect the external display. Same problem? If it works fine for a new account then it's something in your own account which is the cause - perhaps an element of connection or some other system changes induced by the operating system previous and who does not play nice with Sierra.

• Switching the external display to MBP screen retina, poor quality, need to restart FF19.0.2

  Here is the chronology of the events:

  (1) FF start on my MBP (OS 10.8.2) and the retina display working properly.

  (2) connect my MBP to a 24 "external display which has a resolution of 1920 x 1200 (defined as primary) max. FF displays well on screen.

  (3) disconnect the external display and FF is now pixel on retina MBP. Updating of system preferences Dispay doesn't seem to help, or I have not found the magic technique.

  (4) restart FF and everything is fine.

  The question seems so FF not to recognize the need to revisit the resolution of the retina.

  You are welcome

• Portege M700-130 + Portreplicator + external display

  Hello

  We have a Portege M700-130 with the PA3508E-1PRP portreplicator and have a problem with the external display (monitor) connected to the portreplicator.
  The OS is Vista Business. The external monitor is an EIZO S2401WE-GY.

  Now the question:
  * Can you just place your Portege in the portreplicator, start it with the key to the portreplicator and get an image on the external monitor to the connection of the operating system image without doing anything on your laptop? *
  It would already help us if someone with the Portege even and a portreplicator can give us his experience about it.

  Because we can't, but we have absolut want to achieve or better should. We have tested all the settings in the power and hardware configuration options. The point is: when the Portege gets started without portreplicator and is remplace replaced offshore in the portreplicator, then began with the portreplicator the external monitor goes black when loading of the connection of the operating system image. Only after that the laptop screen is fliped open, we get an image on the external monitor.

  Help or an answer, I'd be very appreciated. Thanks in advance!

  Hello

  One of my friends has tested this on the Portege M700 Vista OS.
  It connected the external monitor using a VGA (analog) and DVI port.

  It seems that it works as you suggest in your ad.
  The Portege lid is closed and connected to the external monitor.
  You do not need to touch the Portege M700. He should start by pressing the key of the duplicator.

  Welcome them

• Portege Z30 - A - 18 M - cannot set the native resolution on the external display

  Hello

  I tried to connect two different displays full HD to my Portege Z30 - A - 18 M and I was unable to set the native resolution - maximum resolution I can put for those is 1680 x 1050... I was not so surprised by the first that I had a few problems with a native resolution when I connect to the laptop computer Satellite I had before. But then the same thing happened when I tried the other view.

  I thought that this notebook can handle a higher resolution external... Is there a way to force the native resolution of the external display in Windows 7?
  Thank you!

  Just a question: have you plugged your Portege with HDMI cable and use only the HDMI option?
  With other words went from the desktop to the external display only computer?

  I don't have this machine, but I think you should be able to see the desktop on an external device to the HD full 1920 x 1080 resolution.

• What is the best external display for use with Tecra A8?

  It is perhaps off of a question, but I'm in the market for an external monitor for my Tecra A8. The price range of 400 euro round. Any suggestions?

  Hello

  What size of monitor you want bye? 17TO? or 19a?
  I read checked the product on some websites and the Samsung SyncMaster 970 19a testing? is not a bad choice. You should get to 400Euros.

  But it's usually? not easy to say which screen is best. I think you should visit some computer dealers and compare external displays. You know that you can check the clarity, brightness, contrast and response time. CA? It's important if you want to play games. It should support a low value. For example 8-6 ms

• fixing mac mini external display

  A MacMini can support two external displays.

  What model MacMini?

  This model and make are the poster?

  No way to answer your question unless you provide some details.

• detected external display suddenly stopped working - displays black screen

  original title: detected external display suddenly stopped working

  Hello

  I have searched in several forums, but have not been able to completely solve this problem.  It has been set provisionally and has not yet.
  This system I have:
  HP TouchSmart tx2 tablet pc with Windows Vista Service Pack 2 x 64-bit (Home Premium)
  AMD Turion (tm) X 2 Ultra Dual-Core Mobile ZM - 82, 2.2 GHz
  ATI Radeon HD 3200 graphics card
  I have been working for more than a year with a monitor flat screen Dell ST2310 external monitor and works very well with the setting "use external display only.  From one minute to the next two screen went black so I forced a restart and again the same problem.  I decided to manually disconnect the external monitor by unplugging the VGA cable from the laptop that turns on automatically to the main display as it would if I am disconnected display.  When I connected the VGA cable again the same question in the two screens were entirely black.  I unplugged once more the VGA cable if I could change the settings in Windows mobility.  I plugged back in the VGA cable after changing the settings of "external display only" to 'mirror' devices and after playing for a bit, with the Windows Mobility Center, I had the external display to work again my regular settings: "external display only.  This solution lasted a day and now works in the main screen and the external screen is completely black.
  I tried in vain to solutions:
  -Change VGA cables continues to experience the same issue.

  -Tested according to the specifications and Dell monitor Monitor works fine if the backlight is not the problem.
  -Records update for ATI Radeon HD 3200 graphics card and driver generic PnP Monitor and Dell ST2310.
  -Uninstalled ATI Catalyst Manager and re install now as AMD Vision Engine Control Center.
  -Checked AMD Vision Engine Control Center recognizes the connected external display.
  -Uninstalled the driver Dell ST2310 and re installed the driver.
  -On the screen settings have tried to extend the desktop on the external screen (second)
  Now, this is what's going on and don't know how to fix it:

  -Windows Mobility Center detects a monitor external, even when the VGA cable is disconnected.

  -When it detects the external display it sometimes detects it as DELL ST2310, sometimes as a generic Non - PnP monitor.

  -Sometimes under "Monitor" in the Device Manager, there are several monitors generic Non - PnP contained also the Dell ST2310 and generic PnP monitor.

  -When the external monitor is connected, the screen is completely black and does not work even after changing the settings Windows Mobility or Fn F4.
  Help!

  Hello
   
  I also suggest you to update the BIOS. Visit the manufacturer for more information.
  http://Windows.Microsoft.com/en-us/Windows-Vista/BIOS-frequently-asked-questions
   
  WARNING:
  BIOS change / semiconductor (CMOS) to complementary metal oxide settings can cause serious problems that may prevent your computer from starting properly. Microsoft cannot guarantee that problems resulting from the configuration of the BIOS/CMOS settings can be solved. Changes to settings are at your own risk.
   
  See also: http://h10010.www1.hp.com/ewfrf/wc/document?docname=c01881110&tmp_track_link=ot_recdoc/c00678157/en_us/c01881110/loc:4 & cc = us & dlc = en & lc = en & product = 352607 #N624
   
  Thank you

• Unable to connect to the external display

  Original title - Alienware m17X

  My function keys stopped working, I am tring to connect my Alienware 2210 monitor I hooked up and working before, my computer tells me that it is not connected. The HDMI is plugged into my screen and my computer. When I'm on my desktop and I right click for inside, click Customize my display settings that I click on that opens and then click on connect an external display and it says no connection. All this was that I have to type FN/F6 to change the display of laptop to external display. I know it's a setting I prevent my FN keys work, but I don't know how to fix it?

  Hi RandyHester

  1. what happens if you use the function keys?
  2. What is the exact error message that you receive when you try to connect?
  3. try you the office mirror or extend the desktop on the external monitor?

  Please refer to the below links and check if the information provided allows -http://windows.microsoft.com/en-US/windows-vista/Troubleshoot-multiple-monitor-problems
  http://Windows.Microsoft.com/en-us/Windows-Vista/multiple-monitors-frequently-asked-questions
  http://Windows.Microsoft.com/en-us/Windows-Vista/set-up-multiple-monitors
  http://Windows.Microsoft.com/en-us/Windows-Vista/understanding-multiple-monitors

  I hope this helps.

• No external display is connected?

  I tried to reach my dell inspiron 1545 to an external monitor, my tv using a HDMI VGA cable. But it just says: no external display is connected, I tried changing the settings I think but nothing seems to help. I tried to go the windows Mobility Center to connect it but it still says the same thing. Is there something I can do?

  Thank you very much

  Here is an article on how to connect a laptop to a TV that focuses on the proper cables and runing (I don't see one that you use mentoned, but which means not necessarily that it's the wrong cable - maybe it's just that the article did not consider such a cable when it was written): http://www.geekwithlaptop.com/how-to-connect-laptop-to-tv.

  Here is another article on the same topic, and once again, he seems to focus on using the correct and put cables on day of the dribers for yuur video card (which you should certainly do): http://www.techlore.com/article/10061/How-To-Connect-a-Computer-To-Your-TV/;jsessionid=1DE496C61344D19ABFF4EA7F26F289A3.

  Here is yet another article that also goies how to set display settings in the control panel: http://www.labnol.org/software/tutorials/how-to-connect-laptop-computer-tv-screen-lcd-hdtv/2331/.

  It seems to me that the problem is either the cable, you are usiing (most likely) or with the display settings on BOTH TV and laptop (don't forget the TV may need to be told to use the connection to the laptop using the options menu remotely or maybe controls on the front or the back of the TV - assuming that this is necessary with your TV (and it could be very welll)).  The setup of Vista is enough straightworward and changigg screens is relatively easy once the connection is established.   You must check in the right cable to use and whether or not the TV itself has settings that must be configured.  I would contact tech support of the TV manufacturer for help with these two questions - they can provide you with the answers you need or they can be of any help, but it's worth a try.

  I hope this helps.

  Good luck!

  Lorien - MCSA/MCSE/network + / has + - if this post solves your problem, please click the 'Mark as answer' or 'Useful' button at the top of this message. Marking a post as answer, or relatively useful, you help others find the answer more quickly.

• BlackBerry Smartphones BB Pearl 8220 Flip - external display troubleshooting.

  On a few weeks ago, my father has updated my BB Flip 8220 with the Desktop Manager software that comes with the phone. When he gave me this back, I realized that the external display is empty or just said "T Mobile". Then I noticed several things: when someone would call me, their caller ID would not appear. When anyone text me, I was not able to preview the text I had before. Finally, I was not able to display the elapsed time between the external screen, so I have to unlock my phone to do.

  I looked at other threads that consider external display problems and read about the technique of picking off the dough. But before reading this, I did several times and nothing changed when I turned it back on.

  Now, that said, my question is: 1) is because of my father, blackberry Desktop Manager software update? I lost the usb cable that connects my phone to my computer, but wanted to check if it's something that I could fix it from the phone itself.

  (2) and if it was because of the update, as it did, where would I go to fix it (in the Desktop Manager program).

  Help, please!

  I just found the real solution by reading the post below.  Open the Blackberry Desktop Manager when your 8220 is connected to your PC.  Open Application Loader.  Install the Blackberry attachment Service.  As soon as it finished installing my external screen was back to the clock.  My T-Mobile SIM is currently out of the House and the phone is locked, so I can't try Caller-ID or other alerts until tonight, but if the clock is back I think everything's too.

  Thanks to zwood to validate the correction below.

  http://supportforums.BlackBerry.com/Rim/Board/message?board.ID=8200&message.ID=1170&jump=true#M1170

  Neil

• kernel_task runaway (from 300 to 600%) CPU with 2 external displays

  I have a MacBook Pro (retina, mid-2012), and for a year and a half, I've had episodes fighter during the kernel_task suddenly begin to consume all processor CPU (from 300 to 600%), is the response of the system so slow it is impossible to use.  I experience these episodes throughout the front 1-2 years that the machine went from Yosemite El Capitan and now Sierra.

  Normally, I use my MacBook with two external displays, both at work and at home.  At work, I have two external screens of Lenovo, and at home, I have two screens Apple (Apple Cinema Display 27-inch and 27-inch Apple Thunderbolt Display). I discovered that this kernel_task high CPU usage can only be stopped by disconnecting one of the external screens.  After unplugging an external display, the kernel_task subsides immediately to normal (< 5%).  After a few minutes, I can reconnect the 2nd external screen and proceed normally (sometimes for days, sometimes for hours, sometimes for a few minutes) until the kernel_task pulls up to 300-600% again.  The use of the high CPU kernel_task never happens unless I have two external displays connected.

  Note that since I upgraded to MacOS Sierra fugue kernel_task CPU frequency has increased considerably: of 1 kernel_task runaway every several days to a runaway almost every 10 minutes or so.   I don't have a reason this frequency has increased, but the runaway condition seems to have worsened by the fact that the photoanalysisd daemon is running like crazy on my grand (72 000) library of Photos.

  Also note that I started in recovery mode and have re-installed MacOS Sierra, and it has no effect on the runaway kernel_task.

  Any ideas on how to fix this resumption of kernel_task of all my CPU?

  I have attached my EtreCheck system report below.  This report was captured with two attached external displays.  At halfway while generating a report, the kicks and started kernel_task hogging CPU again.

  EtreCheck version: 3.0.5 (309)

  Report generated 2016-09-25 14:24:02

  Download EtreCheck from https://etrecheck.com

  Time 07:59

  Performance: Below average

  Click the [Support] links to help with non-Apple products.

  Click [details] for more information on this line.

  Problem: Computer is too slow

  Description:

  Sometimes, while working with my MacBook connected to two external displays, the kernel_task pulls up to 600 to 800% CPU and stays there until I unplug at least one of the external screens.  After disconnecting, the kernal_task subsides immediately to normal (< 5%).  After a few minutes, I can plug the 2nd external screen and proceed normally (sometimes for days, sometimes for hours, sometimes for a few minutes) until the kernel_task pulls up to 600 to 800% again.  The use of the high CPU kernel_task never happens unless I have two external displays connected.

  Hardware Information: ⓘ

  MacBook Pro (retina, mid-2012)

  [Data sheet] - [User Guide] - [warranty & Service]

  MacBook Pro - model: MacBookPro10, 1

  1 2.6 GHz Intel Core i7 CPU: 4 strands

  16 GB RAM not extensible

  BANK 0/DIMM0

  OK 8 GB DDR3 1600 MHz

  BANK 1/DIMM0

  OK 8 GB DDR3 1600 MHz

  Bluetooth: Good - transfer/Airdrop2 taken in charge

  Wireless: en0: 802.11 a/b/g/n

  Battery: Health = Normal - Cycle count = 242

  Video information: ⓘ

  Graphics Intel HD 4000

  NVIDIA GeForce GT 650M - VRAM: 1024 MB

  Color LCD 3840 x 2400

  LED Cinema Display 2560 x 1440

  Thunderbolt Display 2560 x 1440

  Software: ⓘ

  macOS Sierra 10.12 (A 16, 323) - since the start time: about an hour

  Disc information: ⓘ

  APPLE SSD SM512E Disk0: (500,28 GB) (Solid State - TRIM: Yes)

  EFI (disk0s1) < not mounted >: 210 MB

  Recovery HD (disk0s3) < not mounted > [recovery]: 650 MB

  Boromir (disk1) /: 499,05 (Go 140,24 free)

  Storage of carrots: disk0s2 499.42 GB Online

  USB information: ⓘ

  Apple Inc. FaceTime HD camera (built-in)

  Apple Inc. Apple keyboard / Trackpad

  Apple Inc. BRCM20702 hub.

  Apple Inc. Bluetooth USB host controller.

  Apple Inc. Apple LED Cinema Display

  ISight Apple Display Inc.

  Apple Inc. Audio display

  Apple Inc. FaceTime HD camera (display)

  Apple Inc. Apple Thunderbolt Display

  Apple Inc. Audio display

  Lightning information: ⓘ

  Apple Inc. Thunderbolt_bus.

  Thunderbolt Inc. Apple display.

  Configuration files: ⓘ

  / etc/sudoers, 2299 but file size expected 1563

  Guardian: ⓘ

  Mac App Store and identified developers

  Kernel extensions: ⓘ

  / Applications/Beats Updater.app

  com.beatsbydre.BeatsDFUSupport [no charge] (2.1.0 - SDK 10.10 - 2015-10-29) [Support]

  /Applications/proxifier.app

  [no charge] com.initex.proxifier.macosx.kext (2.15.2b1 - SDK 10.7 - 2015-09-10) [Support]

  / System/Library/Extensions

  [no charge] com.makemkv.kext.daspi (1.5-2016-09-25) [Support]

  Startup items: ⓘ

  TiVoDesktop: Path: / Library/StartupItems/TiVoDesktop

  Startup items are obsolete in OS X Yosemite

  Launch system officers: ⓘ

  [no charge] 7 tasks Apple

  [loading] Apple 156 jobs

  [running] Apple 108 jobs

  Launch system demons: ⓘ

  [loaded] com.apple.jetsamproperties.Mac.plist (2016-08-25) [Support]

  [no charge] 41 tasks of Apple

  [loading] 153 jobs Apple

  tasks of Apple 109 [performance]

  Launch officers: ⓘ

  [cannot] com.adobe.ARMDCHelper.cc24aef4a1b90ed56a725c38014c95072f92651fb65e1bf9c8e43c37a2 3d420d.plist (2016-07-11) [Support]

  [loading] com.cisco.anyconnect.gui.plist (2014-06-10)

  com.DisplayLink.UserAgent.plist [no] (2012-08-14) [Support]

  [loading] com.google.keystone.agent.plist (2016-07-11) [Support]

  [loading] com.oracle.java.Java - Updater.plist (2013-01-04) [Support]

  Launch demons: ⓘ

  [loading] com.adobe.ARMDC.Communicator.plist (2016-07-11) [Support]

  [loading] com.adobe.ARMDC.SMJobBlessHelper.plist (2016-07-11) [Support]

  [loading] com.adobe.fpsaud.plist (2016-08-29) [Support]

  com.backblaze.bzserv.plist [running] (2016-07-11) [Support]

  com.Cisco.anyconnect.vpnagentd.plist [running] (2014-06-10) [Support]

  com.DisplayLink.usbnivolistener.plist [no] (2012-08-14) [Support]

  [loading] com.google.keystone.daemon.plist (2016-09-09) [Support]

  [loading] com.oracle.java.Helper - Tool.plist (2013-01-04) [Support]

  [loading] com.sharpcast.xfsmond.plist (2013-11-30) [Support]

  User launch officers: ⓘ

  com.backblaze.bzbmenu.plist [running] (2016-09-25) [Support]

  com.vladalexa.MagicPrefs.plist [running] (2016-09-25) [Support]

  Items in user login: ⓘ

  iTunesHelper Application (/ Applications/iTunes.app/Contents/MacOS/iTunesHelper.app)

  HWMonitor Application (/ Applications/HWMonitor.app)

  Hidden CPULed Application (/ Applications/CPULed.app)

  Application of hidden activity monitor (/ Applications/Utilities/Activity Monitor.app)

  Dropbox application (/ Applications/Dropbox.app)

  Hidden SizzlingKeys Application (/ Applications/SizzlingKeys.app)

  Beats Updater Application (/ Applications/bat Updater.app)

  Hidden NET Monitor Application (/ Applications/Net Monitor.app)

  Plug-ins Internet: ⓘ

  FlashPlayer - 10.6: 23.0.0.162 - SDK 10.9 (2016-09-15) [Support]

  QuickTime Plugin: 7.7.3 (2016-09-13)

  AdobePDFViewerNPAPI: 15.017.20053 - SDK 10.11 (2016-08-03) [Support]

  AdobePDFViewer: 15.017.20053 - SDK 10.11 (2016-08-03) [Support]

  Flash Player: 23.0.0.162 - SDK 10.9 (2016-09-15) [Support]

  Silverlight: 5.1.20913.0 - SDK 10.6 (2014-03-07) [Support]

  JavaAppletPlugin: Java 8 update 101 build 13 (2016-08-18) check the version of

  User Plug-ins internet: ⓘ

  WebEx64: SDK-1.0-10.10 (2016-01-23) [Support]

  Safari extensions: ⓘ

  Ghostery - GHOSTERY, Inc. - https://www.ghostery.com/ (2016-03-15)

  3rd party preference panes: ⓘ

  Backblaze backup (2016-07-11) [Support]

  Flash Player (2016-08-29) [Support]

  FUSE for OS X (OSXFUSE) (2013-11-30) [Support]

  Java (2016-08-18) [Support]

  MagicPrefs (2016-01-20) [Support]

  MenuMeters (2014-10-22) [Support]

  TiVo Desktop (2009-11-23) [Support]

  Time Machine: ⓘ

  Skip system files: No.

  Mobile backups: OFF

  Automatic backup: YES

  Volumes to back up:

  Boromir: Disc size: 499,05 GB disc used: 358,81 GB

  Destinations:

  Frodo Time Machine [Local]

  Total size: 999,86 GB

  Total number of backups: 40

  An older backup: 09/09/16, 02:09

  Last backup: 25/09/16, 11:49

  Backup disk size: too small

  Backup size GB 999,86 < (disc 358,81 GB X 3)

  Top of page process CPU: ⓘ

  345% kernel_task

  56% Information System

  44% cloudphotosd

  42% iTunesCacheExtension

  30% activity monitor

  Top of page process of memory: ⓘ

  1.44 GB kernel_task

  1.18 GB com.apple.WebKit.WebContent (6)

  786 MB mds_stores

  590 MB bztransmit

  Mdworker (18) 492 MB

  Virtual memory information: ⓘ

  256 MB of free RAM

  4 pm used GB RAM (5.96 GB being cached)

  768 KB used Swap

  Diagnostic information: ⓘ

  25 sep, 2016, ~/Library/Logs/DiagnosticReports/com.apple.WebKit.WebContent_2016-09-25-134618_ 13:46:18 [redacted] .crash

  System/Library/Frameworks/WebKit.Framework/versions/A/XPCServices/com. Apple.We bKit.WebContent.xpc/Contents/MacOS/com.apple.WebKit.WebContent

  25 sep, 2016, 13:19:15 /Library/Logs/DiagnosticReports/photolibraryd_2016-09-25-131915_[redacted].cpu_ resource.diag [details]

  /System/Library/PrivateFrameworks/PhotoLibraryPrivate.Framework/versions/A/Supp ort/photolibraryd

  25 sep, 2016, 13:06:44 test - passed

  September 22, 2016, 16:03:11 ~/Library/Logs/DiagnosticReports/Microsoft Word_2016-09-22-160311_ [redacted] .crash

  com.microsoft.Word - Applications / Microsoft Office 2008/Microsoft Word Word.app/Contents/MacOS/Microsoft

  Start safe mode, use this way and see if the problem is recurring

• How to calibrate an external display for macOS Sierra?

  Hi guys,.

  seems that on my Macbook Pro after the update everything is strong and displayed correctly.

  However, on the external monitor, a 24 "AOC who was as crisp and sharp as the laptop (kind of I know) the images and the text seems to be well screwed. two attached photos to see the differences between the screens - even cannot correctly read the external monitor

  any ideas on how to solve this problem? or is irreparable? I tried to calibrate the monitor, used the old calibration profiles, etc. looks like illegible

  Thanks in advance

  Hello justme12,
  Thank you for using communities of Apple Support.

  If I understand your post that the quality of the image on the external monitor is as clear and crisp as it used to be. I understand wanting to the external monitor to be as clear as possible. I recommend using the steps in this article to help resolve this problem:

  Get help with graphical problems on external displays connected to your Mac.

  Best regards.

• Scaling to external display

  I have a 2015 retina MacBook Pro with an external display k 4 (Asus PB287Q) and since the update for Sierra yesterday, I can select is more scaling "resolutions" which lie between 1920 x 1080 and 3840 x 2160. HD is far too big, far too small 4K. If you please, that there is a solution to this... I tried to restart, and it actually brought back the correct options until I closed the lid, and now they have disappeared and don't come back.

  That's what my display properties are similar (alt + click on Options):

  

  I had the same problem since the beta and still no word from apple. They completely borked seriously display drivers. I run dual monitors Dell P2715Q. A monitor allows me to choose the old scale with all the resolutions already supported 1080 p up to 4 k. 10.11 I could select the same resolutions on both monitors. Now I'm stuck with the resolutions that you mentioned on my second monitor. If I put my MBP to sleep and wake it up both monitors reflect the resolutions that show you without intermediate options between 1080 p and 4 k.

• My iMac screen went black, I use external display?

  MY iMac screen went out or black.

  Always a good hard drive.

  So can I use an external display to log off

  and wipe the hard drive for recycling.

  Thank you

  Yes. Here is the information on your model:

  Connection of the screen	1 mini DisplayPort
  Display modes	Double view extended and copy video
  External resolution	Up to 2560 x 1600 pixels