They sell PSU testers for $15-20. I bought one years ago and it still serves me well. You plug in the 24-pin and the other power connectors and it will tell you where it’s faults lie. If none, then the motherboard should be scrutinized next.
Capacitors exist all over your system. They are on nearly every component. Look for them and then look for the bulge out the top. There are reliefs (a big X) in the top of the capacitor to allow it to “blow” out that direction. Sometimes it only bulges and does not blow, but that’s enough for failure. If you open your PSU, try not to root around too much with your fingers. Be cautious of the power load that might remain. Visually inspect the caps. It might only be a slight bulge or none at all, but the caps can still die.
I’d lend you a PSU, so maybe you have a friend close who might too? You may still consider buying a new PSU to allow for future upgrades and put the old one on the shelf as a spare or for other purposes. That is, if the PSU is fine. It is still possible the motherboard is at fault, but again with these symptoms, it would likely be a cap.
Good luck!
The only thing I use it for so far is to follow ARS Technica as they don’t have a mobile app, so I just subscribe to their news feed through Mastadon. I was never a Twitter user really so I only do it to support the platform.
Since the protest, I’ve really cut back on social media anyway so that’s good. But Lemmy fits as much as I need this stuff.
I had someone hijack my account last year, Like a dummy, I had failed to setup 2FA. I caught it in the morning after they worked it most of the wee hours. Phone and email had been changed. I contacted PP and to my surprise they were effective in righting everything. By the end of the day, it was corrected. I was absolutely shocked they were so helpful, but I guess it can happen. So, maybe try again?