shit, dude ...I've been hoping someone else would come along, smarter than I.
in your situ i'd just switch out all parts with another working computer of as close to the same hw setup .. but you probably don't have that luxury.
I'm still as stumped as you are, unfortunately
__________________
- + - ° GiRLie GeeK ° - + - °
01110010011011110110111101110100001000000110110101100101
Therell be days/When Ill stray/I may appear to be/Constantly out of reach/I give in to sin/Because I like to practise what I preach