Damn. Getting garbled output in Windows is one thing, but in BIOS and during boot? Ugh. Sounds like the drivers are incorrectly setting something on the card, or leaving some crap behind. I would probably go for SP1 and other Windows updates ASAP, if at all possible. Also make sure you have the most recent platform drivers installed for your mobo.
Problems MIGHT be from corrupt or missing driver elements too, but then again it can be a big pain in the ass to manually remove all driver files. I'd remove the Detonators, install a standard VGA driver, and then do a fresh driver install, making sure that you overwrite every existing file it's installing.
Also it sounds dumb, but there is always the chance your monitor can't support the refresh rate/resolution settings the card is choosing. It might be incorrectly choosing some extremely high refresh rate. Just a guess.
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