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When I forget to put the computer (iMac OS X 10.7.4) to sleep and return several hours later, why does dragging the mouse generate grey pixilated lines on the screen?

Asked by gailcalled (54647points) September 3rd, 2012

I cannot think of any more details. In order to repair it, I have to turn the computer, off, restart it and re-enter my admin. info and password.

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