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HD 6770M 512 MB

Hello, I have a mid 2011 imac 27", 2,7 GHz Intel Core i5, with a HD 6770M 512 MB graphic board.

I am experiencing exactly the same problems as the AMD Radeon 6970M, that is under Apple replacement program. Is it also a known problem?

When I make something heavy for the video card (e.g. a quick zoom in and out of a large picture in raw) the image starts blinking, the arrow of the mouse becomes a colored square and then the computer stops with this coloured scenario frozen. Then the only option is to switch it off.

Any help?

iMac (27-inch Mid 2011), OS X Yosemite (10.10.2), 2,7 GHz i5, HD 6770M 512 MB

Posted on Apr 18, 2015 8:02 AM

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Posted on Apr 18, 2015 9:55 AM

I've not heard or seen any comments here; however, I could have missed one.


The best option would be to take it to your nearest Genius Bar and show them the problem - they'd be able to figure out a solution.

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HD 6770M 512 MB

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