Okay, I am having a serious problem, my computer will not boot AT ALL. I thought it was a bad PSU (450W), so I bought a brand new one (550W), but I'm still having the problem. I thought maybe my motherboard was overheating, if that's possible, so I decided to get a small fan to put on the motherboard. That worked great... for about three weeks, now it's doing the same exact thing. Sometimes, I can get the computer to power up and reach the desktop, but it'll shut down after a few minutes. Now, when I press the power button, I hear my fans start up, and my video card, but it quickly powers down. I see a green light on my motherboard, so I know it's receiving power. Could these be symptoms of a bad motherboard?
is this a recent build? have you try updating bios?make sure connectors are not loose.
Good news, I got the computer to boot up, I'm using it to reply to you now. No, this is not a recent build, it's about three years old. It's a FX6800-01e that I upgraded a bit. I checked all the connections, none were loose. I'm going to try updating the BIOS now. Also, I replaced the RAM with a different kind, and it booted, I had to do this before when it wouldn't power up, weird.
PSU has more than enough power to run everything. I've tried two PSUs, one from a friend, and the current one -- same problem. I believe it's the motherboard, but I don't want to buy a new one and still have the same problem. I know it's not the RAM, two sets of RAM and still the same problem. Applied new thermal paste to the heatsink and GPU, same problem. I checked for loose cables, same problem. Cleaned out the insides, still having the problem. Guess it's down to the motherboard, but I just want to be absolutely sure before I do anything. I know it's not the video card because there's no artifacting or any warning messages telling me that it's overheating. Hoping to get some help about this soon, it's driving me crazy.