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?

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?
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1 Answer

Answer :

Have you looked to see what power settings you have—i.e., what default behavior is in place for the computer’s behavior when it has been idle for some specified amount of time?
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