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モデル番号A1312 / Mid 2011 / 2.7 & 3.1 GHz Core i5もしくは 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.

さんによる

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

さんによる

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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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.

さんによる

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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kristin さん、ありがとうございました!
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