My uncles computer is restarting randomly. It's been happening for over a month and I'm trying to help him out and don't know whats going on. He tells me it just restarts randomly without warning ( no BSOD). Today, it didn't even get to windows, it just hung at the "Dell" logo screen where you can press F2 or F12 to get into bios or boot menu. Pressing those buttons didnt do anything (the keyboard is working fine, I'm typing on it now). So I checked the PSU cable, which seems to be fine, he doesn't have it up against the wall or anthing. So I swapped the ram around, hes running dual channel. I tried 1 stick of RAM only, tried both like this, then put them both back in, and I could get into windows. Then I tried downloading and running memtest, it ran for over an hour with no errors, then the computer shut down. I'm guessing it was one of those random crashes my uncle mentioned. Everything seems to be working fine except these random restarts and I'm pretty much out of ideas as to what might be wrong. Maybe the PSU is dieing and causing these random restarts or I could try reformatting, though I don't think that will fix this issue. I don't want to reformat though, he has alot of things he needs to back up if we decide to do that...anyone have any idea what might be wrong?