sounds like one of the voltage capacitors has gone, if you got it within a year for £12 abit will replace, under RMA give the UK help line a phone the guys are really helpfull as the 90 code means unable to boot past the memory test, so stuffed.
there's a difference between 90 & 9.0 though.
9.0 is where the BIOS should take over from uGuru.
Have you tried clearing CMOS?
It's also been seen to sometimes be power related.