Hi everyone, I just put together a new computer, but I'm having difficulties, and my hardware error diagnosis skills are pretty lacking, so I'm hoping that someone can help me. It looks to me like a PSU issue, but like I said, I don't know that much about it, and it's a nice PSU, so I wasn't expecting any problems with it. Anyway, everything boots up just fine for a very short while. I've been trying to poke around in the BIOS to look for any potential problems there, but the computer has a nasty habit of shutting down after a few minutes. I have the same problem when I try to install Windows. It gets about halfway through loading the installer, and the computer just shuts down. It's worth noting that the first time I tried to turn it on, the fans spun up for less than a second and it just shut down again, so this sometimes happens very fast. Here's the hardware: Intel core i5 660 gigabyte GA-H57M-USB3 motherboard 1.5 TB seagate hard drive 2x2Gb GSkill ram chips. I don't know the model off the top of my head A sony dvd burner, once again I don't know the model right now XFX HD-567X-ZNF3 graphics card Everything but the disc drive and the graphics card were part of a combo deal on newegg, so I don't think there should be any compatibility issues (though I did try running it without the graphics card. It ran longer, but still shut down.) All this seems to point to the psu, but as I said, I'm no hardware expert, and I'd like to get some other opinions before I start sending specific parts back. EDIT: I appear to have fixed the problem, though the solution is troubling. I loaded the optimized default settings for the BIOS. The only setting I had changed was to put my hard drive into ahcpi mode rather than IDE. So running my hard drive in IDE mode is the way to fix it. Does anyone know why this would be? Should I be sending for a new drive?