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I don't. No other desktop in the house, no spare parts π
It's dangerous and you can blew it if you don't know what are you doing but by shorting two specific pins, it's possible to turn on the PSU and see it it's working or not
Did you use a vacuum on the fans and let them spin during the clean?
Not on the PSU fans, and was using canned air cleaning stuff.
Someone else posted a link about testing the PSU. I'll consider it.
When you tear down next, look for missing board components or any that lean at an angle they're not supposed to. Canned air has been known to shear poorly-attached caps or whathaveyou clean off the board. Or maybe one of the wires in the 12v cable is broken and it's delivering power just to most pins... The paperclip test just tells you if the PSU is dead dead, are you able to test with a multimeter instead?
Buzzing while the power supply is off makes me wonder if there's literal bugs in it, if it's buzzing while it's unplugged. I suppose the buzzing could also be remaining power discharging, if it happens just after it's been unplugged.
Honestly the canned air I have doesn't blow that hard, it struggled taking the dust off I doubt it could damage anything. I have had a look over the board and there's no obvious damage.
I'm thinking today's plan might be to buy a multimeter.
The buzzing is immediately after being switched off, so you could be right, could be power discharging.
I pulled a psu out of my rig over the weekend. I was just going to chuck it on Trademe for $1. Let me know if you need it, though shipping might take a few days.
I did a paperclip test and the PSU seems fine, but thanks for the offer. Got to be mobo or CPU I think.