My new ATI Radeon 9550 256MB 128-bit DDR AGP video card will freeze up my system (or shut off the display on my monitor completely) when I try to play a games like Bejeweled or World of Warcraft. How do I keep this from happening?

-Bought a 350w power supply
-Updated drivers (all except BIOS which are OEM)
-On-board is automatically shut-off upon install
-Cleaned the system of all other (& unwanted) drivers

Is there something I'm not catching here?

Computers & Internet - ATI - RADEON Graphic Card