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