iMac screen goes black, but system runs fine in background

Definitely a problem on the 27, mine was the left side.....thankfully I had my screen replaced under apple care but I believe the screen going to sleep or turning off is another issue entirely.

Did you happen to have long periods without the problem recurring thinking it was solved only to have it return later, mine has now been stable for a few weeks so hopefully not.

Hi. It always came back. Toward the end I always had an external 8-inch fan pointed at the back of my 27. (Now with my new 27, I have an external fan, just to be on the safe side.)

But I fear that years of running on the warm end of the spectrum took their toll. I suggest that at the next hint of trouble, give it to someone you dislike. (humour). The trouble always came back.

My iMac goes black screen , can it b fix?

If it is a 2009, I say no. I tried and waisted a year of my life.

I'm having the exact same problem and this fix seems to be working, for now. Thanks for the solution!

did this work? ... i'm working my way through all of this myself. Thanks.

Anyone got any updates on this most annoying problem!!!

I've had zero black screen issues since I went back to booting off my external hard drive with OS X 10.6.8 (Snow Leopard).

Mine works fine when it's booted from a WD external hard drive. I agree it's not the hardware.

HI just reporting have not had any black screens since reinstall

Hi gomoweb,

That's reassuring news. 🙂

Which OS version did you install?

Sierra 10.12.5 I've been using every day for at least 8hrs a day mostly doing video or audio restoration. it's not skipped a beat

Sorry wheelz27 I thought I'd replied but obviously didn't press the right button I installed Sierra 10.12.5

I don’t know why but that seems to work!! Had the same problem with my late 2011 iMac ; thanks

wildkarde, i am running el capitan and have the problem.