I took my pc to a technician for a format...Everything was fine,except that the DVD-ROM couldn't open...I opened up my pc box took out the DVD-ROM and i fixed it...however,when i closed the pc box and connected it with everything again it wouldnt connext with the monitor...Everything was ok(dvd,cd opened,lights where on) but it the monitor didn't display anything...However,the monitor recognized that it was connected but it showed black...I connected the monitor with another pc and it worked fine...does anyone know what the problem is???Did i do something wrong when i opened the computer's box???is it a problem with the video(graphics card)?!!! *Before i opened the pc box the monitor connected fine with the computer!!!