Radeon 9250 issues

[Reverend]

For the longest time I've been using a PCI 9200SE but recently I've upgraded to a PC with an actual AGP slot and acquired a 9250 to use... only.. it's been giving me all kinds of hell since the start. Newest drivers from Catalyst didn't do the trick, trying the drivers that came on the CD with the card didn't do the trick, and now I can't even get my system to boot up if the card is in the AGP slot. It'll do the 'all is good' beep and start whirring to life and then just.. power down. Anyone have any ideas?