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Model A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5 or 3.4 GHz Core i7 Processor, ID iMac12,2

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2011 iMac screen goes and stays black

Ready to throw it out the window! I can hear it start up but the screen is black. Took it to get fixed and they reset the LCD cable and it worked at the store got it home and back to black. Now what?

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I took it to another computer store and they had the screen working after reseating the lcd cable. I brought it home still black. Took it back and they said it was the lcd screen.

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this sounds like the Graphics issue the 2011s have. do you have the AMD 6970M? they had a recall a few months back. you might still be eligible if this is the issue. https://support.apple.com/en-us/HT203787

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Yes it is a graphic card issue. every year or so I have to do a tear down and bake my graphics card in the oven. Good as new!

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I bought an iMac with this problem for a good price to solve the problem. I got it temporary worked around, maybe you can try it.

Unplugging the power for a while and putting display brightness to lowest seem to have worked around the problem for a while.

I think the built in power adapter or backlight board is the issue. These are both always powered when plugged in.

This week this workaround didn't work anymore and I'll replace both. I'll let you know what the culprit was.

Dennis van der Pool

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Hey Dennis, just wondering, did you ever replace the power supply and backlight board?

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Hi Jeroen,

I fixed my problem by replacing the LED backlight board, see details here: Screen backlight goes out randomly.

Gr,

Dennis

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Yes this method worked for me. but i noticed that this issue has to do with the LCD screen .

To test my theory i loaded a Linux OS on a USB and booted from USB i noticed the screen stayed on without going black

I repeated this for a WIN 7 using bootcamp to install and it still didn't go black

since win7 has issues adjusting the brightness of the screen .

However, the moment you boot into Apple and its on full brightness it would go black after a couple of minutes but if you reduced the brightness to the minimum it would stay on through out.

Am guessing there is a sensor reading in apple OSx that switches this off .

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The problem got resolved after i replaced the led backlight board. See my other reply above. Works ever since.

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@dennis just wondered if that fix is still good ?

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Any ideas what’s going on here.

Same issue. Tested with 3 different invertor boards as wells as 3 different power supplies and 3 different screens. Still get random black screens but working fine on external monitor.

Anonymous UUID:       E2C6C9FC-2B6D-4C49-920E-42CB10BC9EEF

Panic Report

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I have the 2011 iMac 27 inch and in the past few months the black screen problem has started.

I have a second monitor attached and can see that the system is still operating normally, except for the black screen of course.

Hitting the “control shift eject” sequence works as does hitting the sleep tab on the drop down menu on the Apple symbol. To simply bring the main screen back on hitting any key on the keyboard seems to work, especially hitting the “eject” button.

So to me, clearly this is not a graphics hardware related issue, or an over heating one either.

I believe this is an operating system issue, one which I believe Apple could easily identify and fix if they had the best intentions of their loyal customers at heart. Maybe the want people to get so frustrated with the problem that they will go out and buy a new systems, or am I being cynical!!!

It would be interesting to go back to previous versions of the operating systems to see if at any point an update caused the problem to start but I don’t have the time or inclination to try this out.

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@maus2610 - I would run the onboard diagnostics to see what it tells you.

Restart your system and press the D key

Reference: Mac startup key combinations

Let us know what errors you get.

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Hi Dan, I ran the hardware test and got an error 4MOT/4/40000003: HDD-1382 which I believe indicates a HDD fan error. I also changed the hard drive with a clone I made and ran the test again and got a slightly different error ending in 1344. As far as I can tell my fans are running OK as I have SMC Fan Control installed. Not sure where to go from here.

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hi dan did you ever follow this up ? as you may guess i also have a 2011 27 1312 " with black screen issues... keen to know what actually works

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hi tony, did you ever follow this up ? i have same iMac, same black screen. whats the best fix. fwiw i can see everything on an external screen

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Hi I did find the problem with my system, it seems to have been a loose cable , one of the ones that connect the LCD to the system. I changed my hard drive last year and I think that is when the problem occurred. Haven't had a problem since making sure that they were all properly connected.

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I fixed it by replacing the faulty GPU. Same issue; only video at the external video output.

I tried another LCD, inverter and powersupply. No succes, so I replaced it with a K1200M with custom firmware.

for this issue it’s crucial to know if the external screen is attached as secondary or primary.

logon screen at secondary screen: LCD is not being. Initialized due to loose connection.

I found out troubleshooting that the external screen is mounted as primary when I disconnect the internal lcd partially.

The external screen get primary if the internal lcd is not connected right. if you get a loginscreen at the external screen, this might indicated a loose connection.

with the logon screen on the faulty internal LCD you will get a blurred background visible on the external. In my situation this was a result of a faulty GPU that didn’t feed the internal LCD properly.

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I agree with Tony Wood , its only bad apple software , ( and a locked donw sytem so its hard to find settings )

even a 1 hour tel contact with a very helpfull Apple support agent did not point me in the right direction :(

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and ..... strange enough removing the usb dongle/sender for my wireless (non Apple) mouse proved usefull in detecting sleep to be the problem

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Now a year later it will not come on for more then a few seconds :(

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can anyone help me my iMac won't turn on. I installed the gtx765m which I tried in the iMac on May 21, 2011 and it works perfectly. I tried the screen on another iMac and it works. could there be a problem on the main board?

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Hi, can you give more details. Does your iMac power on and no screen? There are troubleshooting leds on the logicboard, any details on that?

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Did you try:

1) Attach an external screen to the iMac

2) Use only one memory DIMM in different slots

3) More details? If you put it on, do fans run, does it power USB mouse?

4) Do you hear any beeps?

5) Can you measure power usage on the wall when on/off?

6) You tried the screen on another iMac? Can you do it the other way around as well?

7) Does it have network connectivity? Can you ping the machine, does UTP link blink?

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