Lazy mobo
I sort of have this issue with my Gigabyte 990FXA-UD5. Sometimes I will press the power button and nothing will happen. If I come back at a later time it will start right up, but there are many times when it won't turn on(this mostly happens if its been put too sleep or hibernate). I haven't tried a different power supply, but I doubt its the issue(since with multiple tests it comes out fine). My fix is super dangerous and you should not do it, so don't unless if you are YOLOing it. When my PC won't turn on, I will remove the 24pin while the power is on(as in the power supply is on, not the PC), and I will hold the power button while I plug the 24 pin back in. There is usually a spark and that is my sign to "ram the connector back on" and it comes back to life. Its an odd unnecessary problem/fix, but its what I have to do when my motherboard is acting up. I haven't tried putting a momentary switch on the green/ground pins, but I will give it a try the next time it happens lol.
hmmm... yeah not gonna do that
... but yeah.. seems like its some sort of capacitor problem

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