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Q: iMac screen issue - tartan checkerboard pattern

I've had this issue intermittently over the past year. Every coupl of months or so, something makes my screen start flashing/flickering this checkerboard pixelated pattern over the whole screen viewport, so much so that I can't ontinue working and can only restart the computer to rectify the situation.

 

I've posted a video of the errant behaviour here. Can only assume there is a graphics card issue. Does anyone have any suggestions for rectifying this issue longterm?

 

Hardware Overview:

 

  Model Name: iMac

  Model Identifier: iMac12,2

  Processor Name: Intel Core i5

  Processor Speed: 2.7 GHz

  Number of Processors: 1

  Total Number of Cores: 4

  L2 Cache (per Core): 256 KB

  L3 Cache: 6 MB

  Memory: 16 GB

  Boot ROM Version: IM121.0047.B1E

  SMC Version (system): 1.72f2

  Hardware UUID: D70B63FA-9AB8-5C74-9D64-78CC97774149

iMac, OS X Yosemite (10.10.3), iMac 27-inch, Mid 2011

Posted on Jun 18, 2015 4:17 AM

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