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Andreas (82MHz)@82mhz@mastodon.bsd.cafe (2026-09-18 19:36:45)
I just opened up my desktop PC, blew out all the dust with compressed air, swapped the CPU for a more powerful one (Ryzen 3600 -> Ryzen 5800) and closed the case. 

Then I connected power to it, turned on the power supply and something loud popped inside the power supply.

And now I'm wondering what the hell happened. Can a CPU short out the power supply? The CPU was used, but described as working and was visually in perfect condition. And it still is after the power supply blew up, no scorch marks or anything on it, so I don't think that's it. 

I'm kind of puzzled, I don't know what happened there. Any ideas? How do I figure out what's wrong? I could hook up another power supply, but if that blows too I'm none the wiser...

---Replies---

bpl@bpl@snac.bsd.cafe (2026-09-18 19:49:07)
How do I figure out what's wrong?

You can start PSU without plugging it to the motherboard, if it will not start, then everything is clear. Maybe it was only a fuse.
https://www.overclockersclub.com/guides/atx_psu_startup/

Can a CPU short out the power supply?

Maybe thermal grease or something else shorted some pins.