The computer is 8 months old and I have Apple Protection as well, so that's not the problem, but I see other people have experienced a similar issue and I'm up for suggestions as to what you think might be causing the problem. If it shuts down video, the audio still plays, there is just a black screen with no picture to watch. It is indiscriminate, it just does it whenever it feels like it, but not all the time. it happens on my account, my daughter's account, the guest account. The screen turns black when you're on the Internet, playing quicktime files, using Microsoft office, so it happens across different applications. I have to push the power button to get the screen to work again. You'll be in the middle of something and whammo, black screen. It's driving me up the wall and sent my productivity through the floor. For 6 long and painful weeks, my 27" iMac (10.7.5) has intermittently turned itself to sleep mode (black screen).
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