i have one 9800gtx and i faced problems with tr2 550watt!pc starts but there is no signal on the monitor! i wonder... does the psu work and the card has broken.... or the psu has failed this test?????
Try a different monitor,gpu,and psu.
I realize you might not have spares of all three but most people have a spare monitor.
So you could rule that out.
I keep a cheap psu and gpu around for such a purpose.