9800 GX2 doesn't work, tried two already

I built my new PC, and when I put the 9800 GX2 in, it wouldn't boot up. I just get a blank screen and one short beep. I thought it might be defective, so I bought another one to test... same thing happened. Right now I'm using a temporary PNY GeForce 8500 GT card until I can figure out how to get my 9800 GX2 to work. Could it be the power? I have 750W, which should be enough. Here's my specs:

750W power supply
Intel Core 2 Duo E6750
ASUS P5K-E WiFi AP motherboard
2 Seagate Barracuda 500 GB SATA hard drives
Samsung Lightscribe DVD-RW SATA
Floppy Drive
Thermaltake Armor Series VA8000BWS. Has 4 fans.


Anyone know what's going on? I want to get my 9800 GX2 up and running

 

don't have access to another one. i'm using the second latest bios that came out 12/07. I see there's one that came out 1/08. I can try it, but since the january bios hardly newer, and came out before the vid card, i don't think that will help.

it's the coolermaster realpower pro 750w, not 850 (whoops)

 

noope, fit perfectly

 

I had to use the lower DVI port. Normally I would feel like a ******* for missing such an easy thing... but not really -- it's not like they make a note of it in the instructions. Thanks for all your help!

 

LOL trouble shooting 101 try the simplest solution first....We've all missed the small things...Ps enjoy the new card
guess you can mark this as solved