Power went out for about an hour yesterday morning. I didn't worry about it much because all my electronics are behind surge protectors, but when I tried to boot up my old PC this afternoon it didn't respond to the power button in any way. No lights, no fans, no sound, nothing. Checking inside the case, the interior power LED (which is normally solid green, even with the computer shut off) is flickering - not flashing, but going on and off fast enough to look like it's just dimmer than usual.
- PSU - Thermaltake Toughpower QFan 650W ATX 2.2
- CPU - Intel Core i5-2500K, 3,3GHz, 6MB Cache
- Motherboard - Asus P8P67 REV3.1
- Memory - 16Gb Kingston KVR13N9S8K2/8 RAM 8 GB 1333 MHz DDR3
- Graphics - MSI NVidia GTX 970 (4Gb)
- Hard Drives - Two SSD, two regular. I can probably hunt out the specs if it's important.
- Sound card - Asus Xonar
Things I have tried:
Plugged the computer directly into the wall, bypassing the surge protector. Disconnected all peripherals. Disconnected the power supply from everything and tested the main motherboard connection with a multimeter. All the pins seem to be within tolerances. Reseated the RAM. Replaced the CMOS battery. Checked the power and reset switches. Disconnected the graphics and sound cards.
e: To be clear, I shorted pins 15 and 16 on the psu (at which point it started up fine) and checked all the voltages with a multimeter. They all looked fine.