Hello! My beloved PC (specs in sig) is facing some existential issues and I'm concerned--any help is appreciated. Recently, I gently moved the case about 6 feet along a carpet to accommodate a guest, then left for a long weekend on some much needed R&R. The computer lives in my basement, which is humid'ish. When I returned, I went to boot it up to enjoy some Civ 6; no success. The PSU, GPU, and the fans all turn on for half a second, then power off, then on again, then off again, then on, off, on, etc. It's a hopeless cycle of not turning on. I've tried clearing CMOS and reseating the mobo power cable to no effect. Can anyone suggest my next move? Likely culprits? What could have happened? Possibly relevant: this computer has always had a single cycle of on/off before booting. During normal operation, it would spin up once, stop, then boot normally. I never thought much of it. Thank you in advance, heroes.