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27" Core i7 iMac blacks out then restarts itself for no reason...

I've had this new iMac since late November and everything has been perfect. However it has twice now just randomly blacked out the screen and then the computer restarted itself. What could do this? I was just reading a webpage each time. I have never seen a computer do this before... The back of the iMac does not feel hot each time it restarts. I have added for 4GB of RAM to make it 8GB, but would that be an issue. This is very troubling...

Does anyone else have this problem? Or any suggestions?

iMac 2.8ghz Quad, Mac OS X (10.6.2)

Posted on Dec 7, 2009 4:23 PM

81 replies

pedro3178

Level 2

234 points

Feb 27, 2011 1:05 AM in response to Gwyne

In this case the technicians are wrong, as you will see form this forum. many people have this issue and they all have 16G of non OEM RAM, actually apple don't have to sort it as its not their RAM, people are now saying that when they speak to the likes of crucial, they have now made tweaks to tackle the problem. If you ordered 16G from apple when you bought your machine it would work fine.

Apr 16, 2011 11:11 PM in response to Chris Aynesworth

Add me to the list. My 27" iMac 2.66 i5 with 8GB of RAM randomly dies, but then restarts. Almost always happens while running photoshop, but doesn't always happen while using photoshop. Totally random, and only maybe once or twice a month.

Apr 21, 2011 4:07 PM in response to Chris Aynesworth

Hey folks,

I'm one of the original posters about this issue - and I'm, sadly, back. But please see this post in the other thread because I've finally found a reliable (if convoluted) way to repeatedly cause the shutdown:

https://discussions.apple.com/thread/2473276?answerId=15042462022#15042462022