i recently changed over my graphics card 2 nvidia fx 5200 but had 2 change it back 2 onboard graphics due 2 open gl setup etc so i changed it over on the settings screen then i stupidly changed it back over to nvidia and there was no picture on either-when i restart the manafacturar scren shows up and also the windows xpone but then it turns black on both somebosy please help me i got this pc 4 xmas and need it fixed asap!!!