Screen Pixelated During Reboot From Standby

Joined
Apr 26, 2009
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Your Mac's Specs
2.8 INtel Core 2 Duo, 4 GB, 24" screen
I left the computer for about twenty minutes, came back, hit a key to get the prompt for signing in, but instead got a screen full of multi colored pixels. I typed in my password and got in, but the screen stayed the same, pixelating all the open browser windows. I was able to shut down and restart and now it seems fine.

I'm wondering what might have caused it. I've had the unit for a year and a half and haven't done any "maintenance" of any kind--haven't had to. Is there some cleansing routine I should be doing on a regular basis? I realize this may be two questions, but possibly related.

Thanks for any help.
 

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