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Q: Gray curtain covers screen and freezes up my Mac.

A gray curtain slowly comes down over my screen and my Mac freezes up.   A message then appears stating that I need to restart my computer by holding down power button until it turns off and then power up again.    It happens randomly.  I have a 2009 Mac OS X version 10.7.5, processor 3.06 GHz with 4 GB memory and lots of available memory.  Does anyone know what causes this?  Thanks.

iMac (21.5-inch Late 2009)

Posted on Jan 30, 2015 11:39 AM

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Q: Gray curtain covers screen and freezes up my Mac.

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