iMac just keeps blinking and won't turn on

I was downloading the last update and the computer froze just so I turn it off then on again, and it tries to load but then stops. The screen goes black then flashes. Tried to unplug and wait but still the same. Someone knows what to do?

Greetings Campbell,

I'm sure it's painful to have your iMac to be unable to boot with a flashing screen. You are able to start the iMac on a recovery partition by starting at the top and pressing command + R? See this article - OS X: on OS X Recovery. If you can start the way, use disk utility to repair the hard drive.

If you are unable to start recovery, try resetting first controller of system - reset the management system (SCM) controller on your Mac. to see if that produces no change.

Is resetting SMC does not make a difference, try to reset the NVRAM. Follow the steps in this article - How to reset NVRAM on your Mac.

Please repost it here with their results.

Thank you for using communities of Apple Support.

Be well.

Tags: Mac

Similar Questions

  • Laptop power light blinking and won't turn on

    I have a laptop HP Pavilion 1045DX M6 and I recently tried to plug it into a screen RGB, analog and I saw a spark and the laptop off.

    During this time, I ran the laptop directly from the adapter without battery because I don't really use it.

    If the laptop is turned off and I tried to turn it back on and nothing happened. The charge indicator light turned off even though it was still plugged. I thought that maybe the power adapter does work more or something, but I tested it with a voltmeter and there was still power in.

    So I decided to put the battery in the laptop was able to turn on, and after a while, it an area that I never felt heat it before was really hot and later felt like something was burning.

    But anyway, when it started, the screen resolution was really weak and made a maximum brightness. When the laptop end of initialization, it randomly started to install drivers (such as WLAN rapid storage and intel) and Yes. Sound does not work either. I tried to connect the laptop back and battery does not charge.

    I turned off and took out the battery and tried to run the AC adapter only but the light flickered constantly and when I press on it, the WiFi (F12) button light on for a second then back off the coast. I also hear that high frequency noise I have ever heard before somewhere in the laptop.

    I've done a hard reset with no luck. Any suggestions? Thank you!

    Hi @djstar12 ,

    Welcome to the HP Forums!

    I would like to take a moment and thank you for using the forum, it's a great place to find answers. You have the best experience in the HP forum, I would like to draw your attention to the Guide of the Forums HP first time here? Learn how to publish and more.

    I understand that you have attempted to connect an analog RGB display and you saw a spark. The laptop off and then will not re-start. (the battery has been removed at the time). The light on the adapter was not turned on so you checked the voltage on the adapter and it was fine.

    You tried power turn it on with the battery power and booted up with display dim and started to install the drivers, but you have noticed, it was getting very hot in a specific area. Also, you do not have audio and the battery does not charge.

    Once again, you removed the battery and tried so that it starts with the adapter and the light on the adapter flashes continuously. You also hear the treble and when you tried to activate the wireless, he came for a second and then powered back off.

    The only thing that I can suggest to test the adapter and the equipment.

    Using and testing the power adapter AC

    Test of hardware failures (Windows 7, Vista).

    If you determine that it must be replaced or decide to buy a replacement, you can contact HP technical support for other options.

    Please call our technical support at the 800-474-6836. If you do not live in the United States / Canada region, please click the link below to get help from your region number Plan of the Technical Support site .

  • 700 Lenovo does not load and won't turn on

    I bought a 700 Yoga and after a few months it stopped charging and won't turn on. When you press the power button the light flashed amber a couple of times but that he was. I returned it for repair and repair says footnotes the BIOS has been updated and it worked again. Unfortunately the person making repair sliced the top of the laptop with what seems to have been a Stanley knife, but they said nothing. I returned it and got a replacement.

    Now, a few weeks later, I have exactly the same symptoms with the new 700 of Yoga. Is this a known problem with the 700 because it seems too much of a coincidence? I'll probably just ask for my money back, unless someone can tell me a miracle solution?

    Any help would be greatly appreciated.

    Just a quick follow-up. I bought a cheap compatible charger and my laptop began to charge again. In my case, it is a broken charger that has been the problem.

  • Why my WIFI on my computer turns off by itself and won't turn it on?

    I have a Dell Inspiron e1505 with windows XP home. My internet works fine. I have the latest drivers for my computer. But my WI - FI goes off without reason and won't turn on, so I have to restart the computer. When this produces the sound on my computer also starts to act "weird." I begin to hear a crackling sound or the sound stops, but not all the time... just to milliseconds. I have re-installed the driver for audio that came on a CD, but the problem occurs again when the wi - fi goes out of himself. Help, please! I don't know what to do!

    Hello

    · What is the service pack installed?

    · You have security software installed?

    Try the methods below:

    Method 1:

    Follow the steps from the link below: how to fix wireless network connections in Windows XP Service Pack 2: http://support.microsoft.com/kb/870702

    Method 2:

    Download the troubleshooter from the link below and run the same thing and check if this may help; Troubleshooting Microsoft Windows XP-based networks wireless in small businesses or individuals: http://www.microsoft.com/downloads/en/details.aspx?FamilyID=35c7e5ad-59e7-477b-9d27-6a7030e67002&displaylang=en

    Method 3:

    Run the verification and virus scan online if any malware or virus detected on the computer activity. You can run the scan for viruses online from the link below: http://www.microsoft.com/security/scanner/en-us/default.aspx

    NOTE: Make sure that you select the correct version of the operating system before downloading the scanner)

  • iPhone 5 turned off and won't turn back on

    Hi guys, my iPhone 5 turned off and won't turn back on despite my efforts to load. He doesn't have anything happen when the charge as the battery showing it is low or that the phone needs to be recharged.

    http://cosmouk.cdnds.NET/15/43/1445347217-iOS-low-battery.PNG

    It doesn't have this show in any every time I try to turn it on and even while there is no evidence a load.

    I corrected it when I contacted Apple support. They broke down the power and Home button to force restart it. Works fine now, battery has been replaced but because she is "consumed".

  • Hi, my iphone 5 turned off and won't turn on.

    My phone was in charge all night, and it turned off this morning showing no signs of the battery. I put it on charge but it turned off and won't turn on again. He has been in charge for 3 hours now, what should I please?

    Try to maintain Power + "Home" button until the Apple Logo appears

    If prior work don't try connecting to iTunes holding the home button & restore the phone!

  • IM playing final fantasy 8 on pc and using my xbox controller but in the game that the cursor just keeps scrolling and don't know what can not please help

    IM playing final fantasy 8 on pc and using my xbox controller but in the game that the cursor just keeps scrolling and don't know what can not please help

    Hello

    Xbox articles:

    http://forums.Xbox.com/xbox_forums/b/default.aspx

     

    For more information:

     

    Contact Xbox support:

    http://support.Xbox.com/en-us/

     

    Xbox LIVE Support:

    http://support.Xbox.com/en-us/Xbox-Live/browse?XR=shellnav

     

    Games for Windows LIVE errors:

    http://support.Xbox.com/en-us/Games/PC-games/games-for-Windows-errors-messages

     

    Management of the Windows Live ID:

    http://supportuat.Xbox.com/en-us/pages/Xbox-Live/how-to/Xbox-Live-account-management/manage-Live-ID.aspx

  • HP Officjet Pro 8600: Power light blinking and can't turn on or off

    Printer has power light blink and wll not turn on or off

    [Moved from comments]

    Hi neuserivergirl,

    1. have you made changes on the computer before this problem?

    2. which version of the operating system is installed on your computer?

    What version of the operating system Windows am I running?

    http://Windows.Microsoft.com/en-us/Windows7/help/which-version-of-the-Windows-operating-system-am-i-running

    You can disconnect the power cable from the plug, and then try to turn on or off.

    It seems to be a hardware problem, I suggest you contact the manufacturer of the printer for assistance on this issue.

    http://WWW8.HP.com/us/en/contact-HP/contact.html

  • "HP OFficejet Pro L7680 turns off and won't turn back on"

    HP OFficejet Pro L7680 turns off and won't turn back on.

    Hello untech,.

    I see it's been a while since you have posted with us on the HP Forums.  Please, let me take a moment to say "Welcome Back".

    I see that you have a problem with the printer l ' auto turn off and not turning it back on.

    You happen to have the printer power cable connected to a power strip/bar?  If so, please try to connect the printers power cable directly to a wall outlet.  Here is a document that explains the problems when connected to an uninterruptible power supply/Strip/surge protector power.

    The printer in the document is a LaserJet printer but this document is intended for HP products in general and only use the LaserJet printers for example.

    I'll also include a document indicating when the HP printer will not be running or to respond when the power button is pressed.

    If by chance the problem is not resolved after you complete the steps described, then I would say call the HP Technical Support to see all the other possibilities for you. If you call in North America, the number is 1-800-474-6836 and for all other regions, please click here: click here.

    Please do not hesitate to write me again if you have any other questions.

    I wish you a great Monday!

    See you soon,.

  • When I click to choose a square plan boxes just keep spinning and don't be loading can not someone help?, when I click to choose a plan the just square boxes continue and don't load can someone help?

    When I click to choose a square plan boxes just keep spinning and don't be loading can not someone help?, when I click to choose a plan the just square boxes continue and don't load can someone help?

    Try a different browser.

  • iPod touch off and won't turn on

    I just bought an ipod touch not even two days ago and I have updated to ios 9 yesterday and everything was fine. I woke up this morning with it still works and a few hours later went to use it and it won't turn? I thought it was dead, so I plugged in the charger and it still doesn't react? Anyone know what is happening or how to fix it?

    Force restart your iPod.

    Press and hold the sleep/wake and home buttons at the same time for at least 10 seconds until you see the Apple logo.

    If this does not help, follow the instructions here.

  • Alienware x 51 5 beeps and won't turn on.

    I got my x 51 for about 3-4 months now and after that I restarted my computer it turned their backs, making 5 intervals of beep and won't start... I tried fixing it all in, I'm really worried because I saw this as a common problem with this system.

    I tried this soolution but id does not work: http://en.community.dell.com/support-forums/desktop/f/3514/p/19477069/20241901.aspx

    Any help appreciated. Thank you.

    I would recommend that you contact Alienware technical support and ask them to guide you through some troubleshooting.

    X 51, 5 beeps's graphical associates.

  • Will not let me delete a file, it just keeps opening and downloading nothing and computer frezzes

    Need help suddenly onto computer called ntuser.dat she says corrupt usually open, but it keeps opening and computer frezzes his in document and settings, and then in my folder by name I have tried everything to remove it, but can't get rid of it messages error says cannot delet used by another program, but it's not and so I need to know how to get rid of.

    Thank you

    Hello


    1. have you done any software or hardware changes on your computer before this problem?
     
    NTUSER. DAT contains the custom settings of the user for the majority of the software installed on the computer, including Windows itself.
     
    Method 1:
    Description of Windows XP and Windows Server 2003 System File Checker (Sfc.exe)
     
     
    Method 2:

    Check out these links to create a new user profile and check if it works.

    How to create and configure user accounts in Windows XP
    http://support.Microsoft.com/kb/279783
     
    How to copy data from a corrupted to a new profile in Windows XP user profile
    http://support.Microsoft.com/kb/811151
     
    Hope the information is useful.
  • 10 years, sony kp-51ws520 red led standby blinks 9 times and won't turn on or turn off

    I have an old Sony kp-51ws520 under 10 who has no picture or sound. The Red standby light continues to Flash a series of 9 blink. It does not react to the power power button. Power reset doesn't work or change anything. To turn off the game, it must be disconnected. Suggestions? Thanks a bunch! LJ

    Hello

    You can try this Thread. This migh be useful.

    Thank you...

  • Phone just turned off and won't turn back on! only 3 weeks

    Is that what I should try or should I just go back to Carphone warehouse?

    @cushy

    It's strange, but you can try this:

    connect the phone to a wall charger > press and hold the power & volume for 10-15 seconds > let charge for 3 hours > check if it restarts.

Maybe you are looking for

  • What improvements does 3.7 BIOS for Tecra M series contains

    Hello I'm about to change the hard drive of 80 GB for a Toshiba MK5055GSX, a disc with allegedly similar to the original, including the freefall (FFS) sensor which I assume is the same Easyguard installation in the existing drive. I have also updated

  • Install firefox on my laptop

    I have a HP with windows vista, which is supposed to be compatible with firefox. This has happened Just once or twice I tried to download firefox User Agent Mozilla/4.0 (compatible; MSIE 8.0; Windows NT 6.0; Trident/4.0; GTB6; FunWebProducts; SLCC1;

  • Skype has become completely broken - 10 Windows

    I was using the latest version of Skype when I noticed strange problems happening. For example, if I was in a Skype call with someone I couldn't type in the call window (I was able to do this very well before). If I call others and then try to 'Add'

  • E171FPb, pilot?

    Help - I can't find the driver for the video controller (VGA compatible) for monitor E171FPb on the Dell web site.

  • Conditional fields

    Is it possible to do a required field depending on the how of a previous button or if a user has clicked on a box?Thank youKim