So a few days ago, I tried going back at a computer I failed to fix, as it had been having issues starting up (before it POSTed.) To go into more detail, you could hear the HDD spin up, the CD-ROM drive starting, the FDD cycling, and then the board beeps. Everything but the board powers down and starts powering up again, and it would get stuck repeating that scenario. I tried resetting the BIOS, removing unnecessary jumpers, replacing the battery on the motherboard, removing all the variables (modem card, HDD, CD-ROM, FDD,) but nothing seemed to work. After I fiddle around with stuff on the board, it doesn't want to turn on AT ALL. I immediately believe I damaged the board with an ESD, and tried loving around with the front panel connectors trying to get it to turn on. My little brother comes over, asks what's wrong, and immediately, he gave me one of his older power supplies to try it with.
It posted after the swap. I felt really unintelligent at that moment.