My screen periodically becomes pixelated, forcing me to reboot.  Mavericks which failed to resolve the problem.  Any suggestions?

Since installing Mavericks, my screen periodically becomes pixelated, forcing me to reboot to resolve the problem.  I've tried reinstalling Mavericks which failed to resolve the problem.  Any suggestions?

You may have the mid-2010 problem. There's an issue with the graphics module on that machine. There was a program in place to replace the motherboard within 3 years of purchase, but you're probably outside of that. Some folks have supposedly gotten theirs changed outside of that period, so you can try.
http://support.apple.com/kb/TS4088?viewlocale=en_US&locale=en_US
What you can do to use it is download gfxstatus from http:gfx.io and force the graphics to Intel.

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