Hmm, most odd. Just changed the boot order in my bios so that rather than HDD1 booting, it's booting from SCSI (my SATA raid controller), and XP has booted up fine (no bootloader though)

So where do I go from here to get Vista to boot as well?
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Mk2a RioCar 120Gb - now sold to the owner of my old car
Rio Karma - now on ebay...