i bought a video card (POWER COLOR ATI RADEON 9950) and replace an sparkle geforce forgot the specs. then i replaced the old one by the one o bought. my way in replacing it is by: 1.) uninstall the video card driver 2.) turned off the computer 3.) replaced the old video card w/ the new video card 4.) turned on the computer after i turned it on the pc don't have display and have no beep. considering every precautions, what seems to be the problem?