I've recently just build a computer and I can't get it to display anything. all the fans spin and all the motherboard lights come on but there is no display. it's not the graphics card because I already tested it in another PC and it worked fine. I switched the ram to the other slot. still no response. I've tried two different hard drives as well and I still haven't got anything. I can't seem to figure out what it is and I feel like I've tried everything. can anyone please help?