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Mar 25, 2016 7:35 AM in response to gilligan5000by gilligan5000,Just got the call...after 6 days of being with the genius bar they weren't able to "reproduce the problem". My guess is that I can take it home tonight and reproduce the problem in 15 minutes, but whatever. Its not like I expected them to stand behind their product anyway...but it sure would've been nice.
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May 16, 2016 3:33 PM in response to gilligan5000by edmundo,It's happening with mine when i play youtube videos since capitan upgrade
iMac (27-inch, Mid 2011)
Processor 2.7 GHz Intel Core i5
Memory 16 GB 1333 MHz DDR3
Graphics AMD Radeon HD 6770M 512 MB -
Jun 20, 2016 5:33 AM in response to jgilly26by iShinne,i have this issue on my iMac 21.5 inch (build mid 2011, AMD Radeon HD 6750M 512 MB) after updateing from 10.8 to 10.10.5 Yosemite.
That happens after switching the desktops or tabs. mostly a few blocks, sometimes the complete screen is full rgb-colored and a complete freezing.
SMC Resett and NVRAM resett doesn't work well
