No signal at all? (need help w/GF4 4400)

I just bought a GF4 4400 bundled by MSI. Not only did it not work.. it didn't send a signal at all. The card was seated properly, the card was running (the fan), bt the monitor did not receive any signal from it. I'm using a tyan tiger 230 mobo, I just flashed the bios. As for other tests, the card works just fine on my soyo mobo. Both have the same alternate hardware installed (NICs, soudn cards...). The only difference is that I'm running dual pIIIs and have 2 512 MB ram chips on the tyan, while I;m running one pIII 500 and 128 MB on the soyo.... any clues at all? I talked to MSI and they said that there were no incompatability issues w/dualies. I have not gotten ahold of tyan yet.