Red screen and freeze... huh?

I was happily viewing a simple .mov file before, when the computer suddenly froze and a red curtain came down from the top of the screen (not solid... but making everything on my screen tinted red). Little spinning wheel... everything else frozen. On reboot everything seems to be back to normal. I asked Applecare... they never heard of such a thing.
Any ideas?

I had the same problem happen to me twice. And it occured whenever I viewed a quicktime movie file. It doesn't do it anymore, but you never know...
It must have something to do with the graphics card.
iMac 17-inch: 1.83GHz Intel Core Duo   Mac OS X (10.4.5)   512MB (single SO-DIMM) 667MHz DDR2 SDRAM | 160GB Serial ATA hard drive

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