I have a ti4200 working awesome with that board. My system hung up too when I pushed the AGP voltage up to 1.6v. The manual says 20 seconds to clear the cmos. I pulled the battery out, waited a couple of mintues, and turned on the computer without the battery in. That did the trick.
Good chance it's a bad card.
P4's @ 3600Mhz ()wNz J00 4LL!!!!!!