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Aug 9, 2016 11:50 AM in response to snakegramsby jameson.h,Hi snakegrams!
I understand your iMac's display is showing pixelation and it freezes. I'm sure you'd like to get this fixed, so I'm happy to offer some help. The first thing you should do is to reset the iMac's NVRAM. Here are instructions:
How to Reset NVRAM on your Mac
Thanks for using Apple Support Communities.
Cheers!
