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 @#!^&%$*(!