That's exatly my problem. I have Asus P3V4X (694X) mobo + GF2 GTS and when I turn the comp on I hear one long beep followed by three short beeps than I press reset and it is normal again. I read in Geforce FAQ that my mobo doesn't boot w/ GF 256 and up. Abit VIA Apollo Pro 133A owners have this problems too. In my case this happens because the mobo doesn't supply enough current to AGP slot (GeForce 2 draws 3A from the 3.3V rail).
Now I have to use the Diamond Viper II and I can't play games w/ this @#!^&%$*(!
See if it can help:
GF FAQ: <A HREF="
http://www.technologyvault.co.uk/geforce/faq.php?list=c... " target="_new">
http://www.technologyvault.co.uk/geforce/faq.php?list=c... </A>
Hardware mod to make my mobo work w/ gf: <A HREF="http://
http://www.guyzhangout.com/p3v4xmod.htm " target="_new">http://
http://www.guyzhangout.com/p3v4xmod.htm </A>
>>>See an old post I've posted about my problem at mobo section. If u find it.