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Q: Hello I updated my software on my MAC to 10.10.5. It seemed fine until the screen started showing hundreds of small flashing squares during all operations. Eventually it can totally lock up the screen and computer. Any ideas?

I upgraded my iMac to 10.10.5 and have seen flashing small squares appear on the screen after a few minutes of operation. They build up to hundreds of squares across top and bottom of the screens. Sometimes I have to restart but they come back.

Any ideas?

iMac, OS X Yosemite (10.10.5)

Posted on Sep 13, 2015 3:59 AM

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Q: Hello I updated my software on my MAC to 10.10.5. It seemed fine until the screen started showing hundreds of small flashing squar ... more

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