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모델 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.

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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.



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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

Sat Jan 12 15:02:22 2019

  • Panic Report ***

panic(cpu 6 caller 0xffffff8001605ecd): Kernel trap at 0xffffff80015eae1b, type 13=general protection, registers:

CR0: 0x0000000080010033, CR2: 0x00007fffa364f02d, CR3: 0x000000022032b000, CR4: 0x0000000000002660

RAX: 0x00bfbfbf00bfbfbf, RBX: 0x0000000000000000, RCX: 0xffffff800d25e000, RDX: 0x00000000533ce620

RSP: 0xffffff910c2fba30, RBP: 0xffffff910c2fbbc0, RSI: 0xffffff8015068260, RDI: 0xffffff8001c89428

R8:  0x0000000000000000, R9:  0x0000000000000000, R10: 0x0000000000231722, R11: 0x0000000000000000

R12: 0x00000000000000ff, R13: 0x00007fffa364f000, R14: 0xfffffe89870d2278, R15: 0xffffff80143aa810

RFL: 0x0000000000010202, RIP: 0xffffff80015eae1b, CS:  0x0000000000000008, SS:  0x0000000000000000

Fault CR2: 0x00007fffa364f02d, Error code: 0x0000000000000000, Fault CPU: 0x6, PL: 3, VF: 0

Backtrace (CPU 6), Frame : Return Address

0xffffff8102775df0 : 0xffffff80014f210c 

0xffffff8102775e70 : 0xffffff8001605ecd 

0xffffff8102776050 : 0xffffff80014a3743 

0xffffff8102776070 : 0xffffff80015eae1b 

0xffffff910c2fbbc0 : 0xffffff800156eb65 

0xffffff910c2fbd50 : 0xffffff8001570c61 

0xffffff910c2fbf30 : 0xffffff80016062fc 

0xffffff910c2fbfb0 : 0xffffff80014a3655 

BSD process name corresponding to current thread: xpcproxy

Mac OS version:


Kernel version:

Darwin Kernel Version 16.4.0: Thu Dec 22 22:53:21 PST 2016; root:xnu-3789.41.3~3/RELEASE_X86_64

Kernel UUID: C67A8D03-DEAC-35B8-8F68-06FF7B687215

Kernel slide:     0x0000000001200000

Kernel text base: 0xffffff8001400000

__HIB  text base: 0xffffff8001300000

System model name: iMac11,1 (Mac-F2268DAE)

System uptime in nanoseconds: 35877834483

last loaded kext at 30208840729: 1.9.5d0 (addr 0xffffff7f83904000, size 36864)

loaded kexts:

tc.tctechnologies.driver.PaeFireStudio 4.2.1 46437 1.9.5d0 1.70 5.0.3f1 110.23.14 1.0.2d2 3.0 1 127 278.56 278.56 278.56 1 1.0.1 3.6.4 1.4.8 7.0.0 10.0.2 1 3.13.79 1.0.0 1.4.8 4.0.0 4.1.0 5.0.3f1 170.9.10 1.2.15 3.1 5.0.3f1 404.30.1 404.30.1 340 3.0.1 1.0.0d1 1.0.0 40 366.30.3 394.30.2 295.20.1 10.2.7 5.5.5 700.74.5 326 2.0 5.0 1.8 2.1 5.0 1.7 219.0.0 172 3 8 219.0.0 11 1.0 278.56 525 153.3 1.0 3.13.79 2.2.7 278.56 278.56 1.0.14d1 1.0.0 1.4.8 3.13.79 1.0.0 5.0.3f1 5.0.3f1 5.0.3f1 1.1.0 513.1 3.1.9 1.0.14d1 513.1 6.0.0d8 4.0.4 394.30.2 131.1.1 1.1 307.7 205.12 1.2.0 5.0.0 5.0.0 1.1 1 1.1 394.30.2 1.8 1.8 1.8 3 266 394.30.2 1.0.3b4 1.0.1b8 900.4.1 4.6.5 1.0 900.4.1 1200.12.2 3.2 1.0.4 288 1.1 1.1 1.1 1.1 1.1 2.1 2.0 2.0.0 1.1 300.0 1.0.0d1 2 1.0.5 1.0 1 1.1 1.0 444.41.1 2.1 31 28.30 5.0 2.9 1.4 1 1 1.0

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