I'm fairly computer savvy, I wouldn't call myself an expert. So I started having problems a while ago with my desktop. It would turn on for a brief period and shut down after a few minutes. I would turn the system back on and it would stay on for a little shorter period. I would do this several times, each time decreasing in the amount of time that the computer was actually on, until it would start and turn off almost right away. I thought that it might be a power supply problem so I installed a new one and was met with the same problem. I didn't know what it might have been at that point and I was planning on upgrading the system in a few months anyway and figured this was the best time to do it if I was going to be getting my hands dirty. I know now that that wasn't the smartest of ideas. After assembling the computer with the new parts it was still having the same problem, but it wouldn't load into Windows because I think I needed to fix some things in the BIOS. During the few minutes I had to work with the system, I changed something in the BIOS menus, but I can't remember what I did. Ever since then I can't get anything to display. My brother's HDD went out on his computer so I thought I would try swapping each one out and putting in a Windows Boot disk to see if it would respond to one or the other, but I got nothing. Since I tried that, the system stays on for as long as I leave it sit, but the keyboard wont respond. It lights up when I first turn the computer on, but I can't Num lock it or anything. I tested the keyboard on another computer already. Here's what I have right now, the items with an * before them were in the previous system configuration: Intel Quad Core2 Q9450, LGA 775 2.66 GHz, 12MB L2 cache DFI Motherboard P35 Series (No onboard video) 4 Gb Ram *500Gb HDD *100Gb HDD (Operating system) *XFX Video Card (can't remember the specs off hand- its been a few years) I have no idea what to do any more and feel like if I did do something I would mess it up more. Thanks for your help!