after fitting a new asus a7v600 motherboard cpu and video card, my windows\nxp will\nnot start. I swapped the original hard drive with xp installed, which was\nstarting fine.but since swapping the new motherboard and bits it will not\nget past the black boot up screens. all it does is constantly restart. I\nhave tried safe mode and it still does the same. I put the hard drive back\nin my old pc and it starts fine. am I missing something?