blank screen/freezing on XP boot

Whenever I start up my machine, I get the following results:

Normal: After the Windows XP loading screen, I get a completely blank
screen (no cursor etc), at which point nothing happens, ever.

Safe mode (any safe mode): The system begins loaing, but freezes when
loading agp440.sys. When agp440.sys was disabled using the recovery console,
the loading hangs at Mup.sys. I don't want to disable that, because I don't
know what it does, or how important it is. Judging by current results,
something else would just freeze anyway.

I have tried manually rolling back the system registry, just in case, using
the recovery console, but no luck. Furthermore, when I tried to run a repair
install, I discovered that my disc doesn't offer that as an option; only a
complete reinstall.

I don't think this is a hardware-related issue, because I also booted up the
machine on a Gnoppix disc, and it ran fine (bar not being able to use any
files on such a backwards O/S).

I'm losing my mind. Somebody please help me. Thanks,
bigFoot
.

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