Boot Camp: Mac Pro won't start after Windows install

After installing Boot Camp on a Mac Pro dual 2.66 (firmware updated), XP installer went through installation & copying files, then restarted. Went to a black screen with white Windows-style text that said something along the lines of "XP cannot start from this CD, press any key to restart." Totally unresponsive, held down power to restart. Will no longer power up. Have reset the SMC without any effect. Makes a brief sound when trying to start, but does not actually start up.
Is there any known power issue that I might be able to solve myself, or is the supply likely blown?
Mac Pro   Mac OS X (10.4.8)  

I put Vista on its own dedicated drive, 64GB Vista, the rest as FAT32 to make it easier to share files. I had to remove the OS X drives in order to allow Windows/Vista to install. Once installed, had a black screen and some blue crash screen, until I ran the BootCamp driver updates.
I would try unplugging your drive(s) first and see if you boot from Tiger Installer DVD - or better, boot Apple Hardware Test (hold down "d" on startup from Install Disk #1).

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