Looks like my BIOS screen does indeed support USB keyboards.

I still need a new motherboard though, it looks like my moment of muppetry also took out my built in sound card, it now cracks and pops like a good'un. Who knows what else could be subtly broken.

I guess I might as well upgrade to a Core 2 Duo while I'm at it...
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Remind me to change my signature to something more interesting someday