No display from HD 5770 after reconnecting PSU.

Hello,

I think I may have unwittingly messed up my video card.

I was replacing a motherboard on an older computer but couldn't get the onboard graphics card to give me an video. I wasn't sure what was wrong with it but I decided to try seeing if maybe the PSU (which I was salvaging from the previous setup) was causing the problems.

So, in my laziness, I brought over my working computer with the HD 5770 and disconnected the main power cord from the motherboard and connected it to the faulty computer's motherboard in an attempt to do a quick check to see if it'd work. I did not, however, disconnect the power to any of the components in the HD 5770 computer, just the motherboard's power. This means that the PSU was connected to everything in the HD 5770 computer except for the motherboard when I powered the PSU up. It didn't work and so I connected it back to my HD 5770's motherboard and now I'm not getting any display on this one either.

I tried resetting bios, updating my bios, reseating the card in multiple slots, reseating my RAM, and reconnecting the power cords. Nothing seems to be working. All of the fans power up fine including the HD 5770 but I get no video from any of the outputs. I had an old Geforce 8800 GTS lying around and it works fine when I hook it up to the motherboard but when I try it with my HD 5770, I don't get any display.

I'm really not sure what to do at this point. Any suggestions/help?


Card: XFX Radeon HD 5770: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
Board: ASRock P55 Extreme: http://www.newegg.com/Product/Product.aspx?Item=N82E168...
PSU: OCZ GameXStream 700w: http://www.newegg.com/Product/Product.aspx?Item=N82E168...


Thank you.