Installed new graphics card, boot failure

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The computer doesn't read the hard drive at all now. I installed a 450w power supply and a 9600 GSO graphics card. Ive double and triple checked all connections and everything seems to be in order. The computer did something strange before all this happened... It made me update the firmware for the DVD drive about 6 times before the hard disk failed.... I had never even asked it to update.

its SATA



I am usually the guy everyone goes to to get their computer fixed, but I am stumped. I need the stuff on the disk for work.
 
I had similar problems with graphics card. It was solved magically by itself after keeping the PC unplugged for several hours. :)
 
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