I got my gtx 295 running in windows xp fine but when I decide to power both the gtx 295 and the 8800gt I just get a blank screen. I think the mac os is automatically assigning the 8800 gt video card at start up. If i try to switch the monitor cable to the 8800 gt after startup it still has no display. It's not a power issue becuase I have an external power source running the gtx 295. Is there a trick to run a windows video card and mac os video card with both of them being powered at all times? By the way I read punkmofo's thread and still no luck.