Graphics Corrupted on G5 iMac

I was wondering if anyone can help me or have seen this problem before. The graphics on my iMac (for all users) have been corrupted. The mouse cursor has box full of little lines and all of the background has little lines of dots running through them.
Everything else seems to be working well, but I cannot figure out what is going on. I checked Disk Utility and there were no problems with the disk, but I figure that something in the OS has gotten corrupted or is there a problem with the graphics card.
Has anyone seen this or has any other ideas of what I can check before I either take it into an Apple Store or reinstall the OS.
I appreciate you looking at this and welcome any ideas.
iMac G5 running latest OS.

Well, you can run the Apple Hardware Test (it's on your OS Install Disk, or on the restore disk). It will probably give you some cryptic Video RAM error.
The most likely cause of this failure is due to bulged electrolytic capacitors in the midplane board, like these, and these.
MacMini G4 1.25GHz 1GB   Mac OS X (10.4.9)  

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