An obvious question, but I don't see it addressed above... Have you updated your video drivers?
I also have an ATI 9800 pro. I installed Doom 3 last weekend and all was fine until I got to a certain place within the game and REBOOT! Went back to the same place and my machine rebooted again.
I downloaded the latest drivers from the ATI site and haven't had a problem since (except getting my ass kicked by Carmack's Hell-spawn).
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Out the 10Base-T, through the router, down the T1, over the leased line, off the bridge, past the firewall...nothing but Net.
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