Maybe someone here can help me.
I got home from college today, and I went to fire up my old desktop. I pressed the power button, but nothing happened. The fans didn't even spin up. The blue light on the motherboard (an Asus P5B Deluxe) is on, and the LED on my mouse is on, so it is getting standby voltage. I plugged the PSU into my PSU tester, and it powered up fine. The main voltages are within spec (I got 12.05, 5.00, and 3.29. It's hard to get much closer than that!). I tested the CMOS battery, and that was OK. I tried resetting the BIOS, but it made no difference. I proceeded to start unplugging everything from the motherboard. Nothing happened until I unplugged the ATA cable from the board itself. It was already unplugged from the CD drive, but when I unplugged it from the board, the computer powered up. I plugged my monitor into the video card, but there was nothing. I tried holding the power button, and it wouldn't go off. I turned it off with the physical switch on the PSU, but then I could not get it to go back on. I kept removing stuff until I was down to just the CPU and a single stick of RAM. I plugged it in (with and without the video card present), but still nothing.
The only change I made was swapping out the CPU when I sold a similar computer on Ebay. I don't remember if I tested it then, but I probably did. Other than that, it sat in my room unplugged for the past 4 months. I pulled the board out and physically inspected it, but everything looks OK. There are no (obviously) bad capacitors, and there is no damage to the board or any connectors. The contacts are all fairly clean. I tried re-seating the CPU (Pentium 4 2.8GHz) a couple times, but that didn't help. The board is a few years old, so it is probably out of warranty.
Is there something I am missing, or something I can try to make it work? I can't think of any reason it would just die without even using it.
I got home from college today, and I went to fire up my old desktop. I pressed the power button, but nothing happened. The fans didn't even spin up. The blue light on the motherboard (an Asus P5B Deluxe) is on, and the LED on my mouse is on, so it is getting standby voltage. I plugged the PSU into my PSU tester, and it powered up fine. The main voltages are within spec (I got 12.05, 5.00, and 3.29. It's hard to get much closer than that!). I tested the CMOS battery, and that was OK. I tried resetting the BIOS, but it made no difference. I proceeded to start unplugging everything from the motherboard. Nothing happened until I unplugged the ATA cable from the board itself. It was already unplugged from the CD drive, but when I unplugged it from the board, the computer powered up. I plugged my monitor into the video card, but there was nothing. I tried holding the power button, and it wouldn't go off. I turned it off with the physical switch on the PSU, but then I could not get it to go back on. I kept removing stuff until I was down to just the CPU and a single stick of RAM. I plugged it in (with and without the video card present), but still nothing.
The only change I made was swapping out the CPU when I sold a similar computer on Ebay. I don't remember if I tested it then, but I probably did. Other than that, it sat in my room unplugged for the past 4 months. I pulled the board out and physically inspected it, but everything looks OK. There are no (obviously) bad capacitors, and there is no damage to the board or any connectors. The contacts are all fairly clean. I tried re-seating the CPU (Pentium 4 2.8GHz) a couple times, but that didn't help. The board is a few years old, so it is probably out of warranty.
Is there something I am missing, or something I can try to make it work? I can't think of any reason it would just die without even using it.