Quite similar issue here, so I'm reviving this thread.
Got a Diamond Viper V330 PCI that doesn't get detected at POST, tried on two different motherboards:
-Gigabyte with NF2 chipset, POST hangs;
-Soyo with MVP3 chipset, gives "no video card" beeps then goes further.
On the NF2 chipset it works great in WinXP as long as there is another video card present, but it is only detected in Device Manager. 3DMark 2k1 only shows the other card (it was a Virge/DX), and so does GPU-z, which means I'm unable to use it to dump the video BIOS.
I haven't booted Windows on the MVP3 board, but since it doesn't hang on boot with the Viper I guess it might behave exactly as amadeus777999 described in his initial post.
The chip is flash-able, there are some BIOSes on the net, what software do you recommend me to try?