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Help think ive blown my psu or mobo :(

Last response: in Components
July 18, 2012 4:08:31 PM

Hi all,

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.

pc specs:

Intel i7 2.66
6gb ddr3 10666
corsair vx550w PSU
8600gts / 280 gtx

so any input into the situation would greatly be appreciated thanks!

More about : ive blown psu mobo

a b ) Power supply
July 18, 2012 11:40:40 PM

If it beeped after post before, pc's usually beep once to indicate a good power on self test, does it still do it or give you more beeps?
July 19, 2012 7:54:19 AM

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?
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July 19, 2012 8:39:33 AM

Sorry cant edit my post

If I only connect the 24pin power to the mobo my CPU fan spins constantly
If I connect the atx12v as well it starts dieing again.
July 20, 2012 1:47:05 AM

Sounds like the mobo bight be dead, I replaced a mobo in an HP laptop that did the something would power on then off, on then off, I found a deal on a replacement mobo and the laptop worked just fine