P4m800-m7 problem it was working good awhile ago, but when i tried to reformat another harddisk, i removed the ide cable from the hardisk installed there, and put it to the hard disk that im going to reformat. The pc opened but there's no video. i tried to place the memory to another pc and its working. i remove the cable connected to video card and inserted it to the built-in video, but still it opens but with blank black monitor. i tried to use other memory but the problem is istill the same. testing its memory, i inserted it to other pc and it worked. i turned the pc on again but still, the screen is sitll black all over. what could be the possible problem of this, am i going to buy a new motherboard then?