decided to upgrade my gfx card as it was starting to fail, blue lines and green squares when it actually decided to boot up with graphics. I just went from a 8600 gts to a GTX 280 and plugged it all in with the pci-e 8 pin and 6 pin and froze while booting, realised I was using the pci-e 6 pin connector instead of molex 6 pin as it needed to be from the 12v rail so put that in then something blew as I put the power on, i was using a corsair vx550w psu which has 41a on the 12v
I have no spare psu to test if that has gone, but now when I put the power on it turns off after 1/2 seconds then tries to boot up over and over again all the fans are spinning aswell. tried booting without a gfx card in same thing happens.
It gives no beeps whatsoever, it just powers up then powers down. I've tried powering without ram/ gfx card and no change.
The only thing that I can get to happen that's different is if I connect the gtx280 instead of the 8600gts none of the fans spin at all and I get a green light on the gtx280. So I'm thinking the psu is blown?