The display goes black intermittently, Processing seems to stop at the same time, It picks up where it went blank.

The display on my older imac goes blank intermittently. It seems that the computer also freezes temporarily, usueall for a second or two, then comes right back where it left off. There doesn't seem to be any predictable timing to the events. They occur a few times daily.  Help!  the computer is no longer under warrantee. Any ideas on how to troubleshoort this. I'm not sure that it is a display issue althought that is what i see. The freezing of the computer during the blackouts might indicate a power supply issue.
Thanks

The display on my older imac goes blank intermittently. It seems that the computer also freezes temporarily, usueall for a second or two, then comes right back where it left off. There doesn't seem to be any predictable timing to the events. They occur a few times daily.  Help!  the computer is no longer under warrantee. Any ideas on how to troubleshoort this. I'm not sure that it is a display issue althought that is what i see. The freezing of the computer during the blackouts might indicate a power supply issue.
Thanks

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