P5A-B ASUS AGP video problems multiple cards

[Markfw]

I tried to put a Radeon 7500 in the AGP slot. It worked, until the boot after the drivers, then a bunch of garbage on the screen. After updating the bios(to 1010), and changing every bios setting I could think of that might help, I gave up. After talking to a friend who owns a PC hardware store, he suggested that that board had serious AGP compatability problems. So I tried a TNT2 32 meg card(new card). Well, it installs great, but when you try to run 3dmark2001se, it says someting like my card doesn't have all the support required, and won't run at all. When I run dxdiag, it verifies I have DX 8.1, and all three of the "things" on the video tab say Enabled, but when it tries to test DX 8.1, it says "3d not available" I know this card is not fully 8.1 compliant, but shouldn't it still work ?

Motherboard problems ?? (I upgraded the AGP drivers to 1.68)
This is posted in general hardware, since it involves multiple components, but someone suggested that I try posting here.

Suggestions are welcome.