PC won't boot after installing graphics card

I bought this card used from ebay. When I first got the card, I hooked everything up, tried to boot the pc and got nothing. No display in the monitor, no fans whirring, just a blinking red light on the front of the pc. I then did some searching around on the internet, and based on suggestions to people with similar problems I tried disabling the integrated graphics on my motherboard. Still no boot.

The odd thing about this (I don't know why I even tried this) is that if I remove the 6 pin power connector from the graphics card, the pc will boot and the fan on the card spins up, but the card is not detected by my computer. Based on that I thought this was a psu problem, but from everything I've read my psu is way above the minimum requirement. I've also tried this with a 680W psu with the same result. Any suggestions?

The relevant hardware:
psu - 575 W Logisys (http://www.newegg.com/Product/Product.aspx?Item=N82E16817170017)
graphics card - XFX 9600 gso 768mb
mobo - intel desktop board d945gcz
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  1. rolli59 said:

    What kind of 12 V amp rating should I look for if I replace the psu? Everything I've read online just recommends certain wattages.
  2. The most important component of the PC is the PSU all other parts depend on it and its quality. Here is a budget Corsair 430 watt unit that has stronger ratings than your logisys http://www.newegg.com/Product/Product.aspx?Item=N82E16817139017 and would run your system just fine. There are better units out there that cost a little more so if you have a budget we can point a few out.
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