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Model A1312 / Mid 2010 / 3.2 GHz Core i3 or 2.8 & 3.6 GHz Core i5 or 2.93 GHz Core i7, ID iMac11,3

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Display shuts off randomly but turns back on after unplugging cable

So I’ve got that imac and it works fine, upgraded the CPU and put a SSD in it but it always had a bit of a weird issue. First it started randomly dimming, it was still full brightness but it sometimes dimmed for a while, a bit more on the right, then went back up again. I don’t think it’s the temps as the computer still ran fine. Now, the display randomly shuts off, black screen but the computer is still running. I sometimes use it as a second monitor for my PC and if I unplug the cable the display turns back on again (I assume because the monitor turns off the backlight and turns it back on again? Moving the brightness settings with the keyboard doesn’t help tho)

I was curious what could be causing the issue? I’ve narrowed it down to either the LCD control board or the display itself? What’s weird is if it was the display, wouldn’t it just not work or only work in some parts of it? Thanks!

Ответ на этот вопрос У меня та же проблема

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By any chance did this start happening after you installed one of Apple’s latest Security Updates? I’ve had an issue with my iMac 27” mid 2011’s display randomly turning off since installing the recent Security Updates 2020-00#. Music still plays thru the speakers and if I am video chatting thru the iMac’s built-in video camera the other person can still see and hear me, but my display is black/off.

I discovered that if I press the <shift><control><eject> key combination, which usually puts the display to sleep, then wait 10 seconds then press any key the display will come back on momentarily.


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I don't think so, I'm still on Sierra so I don't think that's the problem. But it's weird!


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Nar001 будет вечно благодарен.
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