Major X1650 problems

Hi there,

I recently purchased a HIS Radeon X1650 Pro Ice-Q 512MB AGP video card. I installed it correctly, making sure I powered it up using the floppy power cable. But when I boot up my PC the screen remains black, normaly it "jumps" on, the orange LED usualy becomes yellow, but it doesn't. The monitor just doens't get a signal. The fan on the videocard is running fine though. Although I can hear the harddrive spinning when windows is booting, the screen remains black. When I installed the videocard in another system it worked perfectly fine. I've tryed everything, for example I disconnected very piece of hardware leaving only the videocard, but it still doesnt work. There is a new BIOS update available for my motherboard, but it's a beta version, so I'm a bit anxious installing it. I also tryed using another monitor. Here are the specifications of my system:

ASUS K8V Deluxe Motherboard with BIOS v 1011
AMD Athlon64 3200+
2*512MB Kingston ValueRam
Tagan 480W Power Supply

And the specifications of the other system:
(works fine on this one)
MSI K3T Motherboard
AMD Athlon 1,15 Ghz
2*512 RAM
Unknown Power Supply

By the way, I've done some research on the internet and I found some other people with the same problem:

http://forums.filefront.com/showthread.php?p=3465226
http://www.driverheaven.net/showthread.php?t=126330

Haven't found a solution thouh.

BTW, excuse me for my bad english as it is not my motherlanguage

I realy hope somebody got a solution to this problem, whould realy appreciate it.

Thanks for replying,

Yes I've tried both. VGA and VGA with DVI -> VGA adapter. Doesn't make a difference.

Yep, my old videocard works fine, nothing wrong with the AGP slot.