I have an issue where coloured dots (small squares) appear on my screen and it gets to the point where the entire screen freezes although the mouse still moves but nothing works and I need to turn the computer off at the switch. Any ideas?

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I have an issue where coloured dots (small squares) appear on my screen and it gets to the point where the entire screen freezes although the mouse still moves but nothing works and I need to turn the computer off at the switch. Any ideas?

I have an issue where coloured dots (small squares) appear on my screen and it gets to the point where the entire screen freezes although the mouse still moves but nothing works and I need to turn the computer off at the switch. It doesn't happen all the time but is very annoying. Any ideas?

iMac (27-inch Mid 2010)

Posted on May 3, 2015 3:21 PM

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Answer 1

rkaufmann87

Level 10

140,550 points

May 3, 2015 3:40 PM in response to togher65

Reset the SMC and PRAM, if the issue continues then you likely have a failing GPU (hardware) that requires repair. To be sure take it in and have it professionally assessed.

Intel iMac SMC and PRAM resets

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