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Old Jun 13, 2014, 06:14 PM   #26
Tropical John
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Join Date: Jun 2014
Screen goes black

So, if it is a failing video card, it is going to start to fail when it is hot.

That's why turning up the fan and turning down the screen help, doing so keeps your machine cooler.

Your typical Apple store is kept at meat locker temps with all those machines running. Meaning they might not be able to reproduce the problem. Take a video of it failing at home on your phone and take that with you. It's not like you're going to make this stuff up! but hard evidence might be necessary to get them to replace the video card.

PS you can hit alt+command+eject and then space and the screen will come back. Don't need to hard reboot.
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Old Jun 14, 2014, 06:20 AM   #27
ijlakw
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Thanks for the tip!
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Old Jun 26, 2014, 02:42 PM   #28
12Tarona
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Join Date: Jun 2014
27" iMac black screen fixed!!

I bought my 27" iMac in 2011..two years later the screen went black. Brought it back to Best Buy, they put in a new graphics card and some other stuff.. Returned home, shortly black screen returned. Put up with it for a while, returned to Best Buy, they put in a new back light, did some adjustments or what ever, returned home, shortly went black again. I installed a fan software, seemed to help, then went black again. I kept playing with it, shutting it of, turning it on over and over again. Sometimes it'd stay on for a while other times I just gave up and walked away. Finally I returned to Best Buy hot and red-faced. They took it in, called in about 10 days, it was ready.....Yea sure......I was skeptical. Brought it home and guess what?? It's been running almost non stop for 12 days and no black screen. What did they do? No parts! They just went in and unplugged all of the switches and wires and replugged everything again. Evidently one was loosely connected. Seems like they put these things together so fast that sometimes they get a little sloppy and things aren't plugged in tightly enough. It sure worked for me, and I'll bet this is the same problem for most of you guys. Good luck.
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