My roommate's computer recently started making loud noises and wouldn't boot into Windows. The kernel file was corrupted and so I suspected that the hard drive was dying. The hard drive also sounded like it was making these grating noises. Anyway, she bought a new hard drive and I had difficulty installing it because the case was very badly designed. So after I install everything, I push the power button, and nothing happens. Before I installed the HD, I was able to power everything up, but now, nothing is working. No fans, lights, nothing. Yes, it is plugged in and all the connectors are attached to the mobo. What could cause this, and how do I solve it? There are a few things I think it could be. It may have been a bad power supply in the first place, so now it's finally dead (I'm going to test this later by putting my power supply into her machine); or it may be a damaged motherboard; or I may have broken the wire that goes from the power button to the motherboard. Or it could be something else I haven't thought of. What are some ways I could test the motherboard or that wire? Any other thoughts or solutions? Thanks!