I'm a novice computer-builder. My computer broke, and I think the motherboard is shot. Your thoughts? (detailed explanation)
One day I plugged my iPod shuffle into one of the front USB slots, and I got a "Device not recognized" error. I messed around with it for a while, but gave up soon after. A few hours later, the message started popping up incessantly, even though the iPod wasn't even connected. I still had a USB printer and mouse connected, though. Eventually the mouse stopped working, so I connected it with a USB --> PS/2 adapter. The next day, I found that the message had stopped occurring, and the USB slots were no longer working at all. After using my computer for a few minutes, the monitor randomly went blank. I opened up the case to see if the fans were still working. As I was staring at it, it shut off. However, the fans kept running, but they slowed down, almost to the point of stopping. Since the fans were still on, I shut off the power supply. Now, the front power switch does nothing. When I turn on the power supply, the fans start up, but then decrease in speed until they are "jittering."
I thought at first that maybe my power supply was bad, so I tested it. The tester showed that all the connections were good. The PS runs at full power when it's connected to the tester, but when I connect it to the mobo, it does not. I think the motherboard is bad - I don't see what else it could be.
Here is a video of me plugging in the PS to the tester, and then into the mobo (the video only shows the 20-pin connector, but I've tested all of them). You can see the fans slow down. You can skip to the end of the video to see the result (around 2:10):
I've already ordered all new parts (cpu, mobo, video card, ram, PS) because my computer is out-dated and needs to be overhauled anyway, but I was wondering if anyone had any thoughts about what specifically could be causing this.
Another thing is, I noticed the front 120 mm fan was not moving because it was clogged up with hair/dust. I only had two case fans - 1 rear 120mm and 1 front 120mm (one sucks in air and one blows out). I've cleaned my computer a couple of times, but I must have missed that fan because it was somewhat hidden.
ALSO -- I am basically replacing everything except the drives and case. I've never tried this before, but if I installed all the new parts and tried to boot up off of my current windows installation, I'm guessing windows would throw a tantrum of sorts. Is this true? I've heard of people replacing a mobo and salvaging their current installation, but that seems rare.