Monitors flicker and "Input Signal Out of Range"

Hello!

I have a Mac Mini (end 2012) 2.3 GHz Intel core i7 running up-to-date El Capitan, with two HP monitors 2071d.

These monitors have DVI connections. It is connected with Mini DisplayPort to DVI adapter, and the other with HDMI to DVI adapter (provided with the Mac Mini).

Everything has been fine for a year until this week. Two monitors are:

(1) intermitantly began flickering of the scrambled images

(2) flickering intermittently at black or white noise

(3) intermittently flickering white noise

(4) the message of the form 'input out of range Signal. 1600 x 900 at 60 Hz settings."

How is this problem go and come, but rather continues today.

After research, I tried to start safe mode, but the problem persists.

I read that put the computer to sleep and then wake up could solve this problem... it worked a

couple of times, but the issue soon returned.

I tried to reset several times VRAM/LANDAU and SMC.

I doubled checked all the connections.

Under the system of preferences > display (when the image is stable long enough for me to see) everything looks OK. Under the screen of the 'Default display' tab is selected. On the color tab, there are three HP2071d listed (with a selected) in the window display profiles. I've linked by selecting one of the other "HP2071d" listed without noticeable change.

I also reset both monitors to factory settings via the menu screen of the monitors.

I also came across this mini Mac EFI Firmware Update 1.7 for flickering on end of 2012 Mac Minis, but when I tried to run I got "this software don't is not supported on your system. Ugh. It turns out that my Mac Mini is already updated to MM61.0106.B0A (2015-002)

My Information System > Hardware > graphics/display info is:

Graphics Intel HD 4000:

Chipset model: Intel HD Graphics 4000

Type: GPU

Bus: integrated

VRAM (dynamic, Max): 1536 MB

Seller: Intel (0 x 8086)

Device ID: 0 x 0166

Revision ID: 0 x 0009

Exhibition:

HP W2071d:

Resolution: 1600 x 900 at 60 Hz

Per pixel: 32-bit color (ARGB8888)

Display serial number: 6CM3171PFF

Mirror: on

State of the mirror: mirror material

Online: Yes

Rotation: support

HP W2071d:

Resolution: 1600 x 900 at 60 Hz

Per pixel: 32-bit color (ARGB8888)

Display serial number: 6CM3170P31

Main screen: Yes

Mirror: on

State of the mirror: mirror of Master

Online: Yes

Rotation: support

I am of the ideas of what else to check/try.

Thanks for any assistance that anyone can provide.

bdcs64 wrote:

Hello!

I have a Mac Mini (end 2012) 2.3 GHz Intel core i7 running up-to-date El Capitan, with two HP monitors 2071d.

These monitors have DVI connections. It is connected with Mini DisplayPort to DVI adapter, and the other with HDMI to DVI adapter (provided with the Mac Mini).

Quite the same configuration except here, with 2 Samsung S22B310 DVI monitors on an i5 2.5 GHz in late 2012.

Everything has been fine for a year until this week. Two monitors are:

(1) intermitantly began flickering of the scrambled images

(2) flickering intermittently at black or white noise

(3) intermittently flickering white noise

(4) the message of the form 'input out of range Signal. 1600 x 900 at 60 Hz settings."

How is this problem go and come, but rather continues today.

Both monitors isn't good. Which would lead us to think that the Intel HD 4000 is overheating and the problem is not with any of the adapters or cables. Although, if one of the cards was not internally, it could put additional heat stress on the graphics chip.

Personally, I will try a few things.

1. turn off, unplug everything, open the bottom cover and give it a good cleaning to make sure it cools properly.

https://www.iFixit.com/device/Mac_Mini_Late_2012

2. try each monitor individually for awhile configurations see if the problem follows the monitor cable adapter installation.

(I know he'll be a brake after obtaining used monitors to double)

3. try using > MacFanControl to monitor and help control the temperature of the GPU ITPP.

http://www.CrystalIDEA.com/Macs-fan-control

FWIW, I do not use screensavers, but I do a lot of videos as well as some games of light on both my 2010 and 2012 of the Mini and I really believe that MacFanControl has really helped to extend the life of graphics on these two systems.

I use the control based on the sensors on the sensor of GPU ITPP and configured so that it starts slowly rise in power of the fan above 129' F

Tags: Mac

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