Recently I replaced my shared graphics card with a dedicated graphics card. I have a dell dimension 9100 p4 w/ 4gb ddr2. Now when I go to turn the computer on it will blink orange for several seconds to several minutes - in one case as long as an hour - before it boots up. I have read that this would be a mobo or psu failure, however I dont understand how that could be if it does eventually boot up. Any insight would be appreciated.