I decided to clean out my CPU fan as it was clogged, when I assembled everything again it won’t turn on 🙁

It’s an old desktop PC. There are no lights glowing on the motherboard at all, though there is none specifically labelled “power”. Just CPU, RAM, BOOT. None of these light up, not even a flash when it starts.

I have reseated the RAM, CPU, power cables. Removed the GPU to check.

The cord leading in to the PSU works but I don’t have a way to test the PSU itself or the out cables, but I have reseated them at each end.

This PC was working fine before. But with no lights on the motherboard I suspect either the mobo or PSU?

Mobo is asrock x570 PSU is silverstone 650w strider gold S series

Any help appreciated!

  • NeoNachtwaechter@lemmy.worldEnglish
    51·
    13 hours ago

    It’s an old desktop PC

    One (or more) of the electrolytic capacitors in your PSU has died.

    Remove the power cord, wait for 2 hours, open the PSU and look carefully for the candidate(s) with the domed head. Healthy ones are perfectly flat on the head.

    Order a new one and replace it.

        • Dave@lemmy.nzOPEnglish
          2·
          11 hours ago

          I followed someone else’s instructions. Expected putting a paperclip in in and plugging it in/turning it on would cause the fan to start up. It did.

          https://robots.net/tech/how-to-power-up-psu-without-motherboard/

          Fan in PSU started up fine, apparently this is a sign that the PSU is not dead. Fan does not turn on when connected to the motherboard, which supports the theory that the PSU isn’t the issue.

          • tfw_no_toiletpaper@lemmy.worldEnglish
            3·
            9 hours ago

            I had this exact issue on an old gaming PC, PSU wouldn’t power the MB, but would be fine by itself. My GPU had a short, gods know how it happened. Juts keep disconnecting parts and try powering up again until you get the LED indicator. If everything is gone and it still won’t power on, it’s the MB. You could get a multimeter and measuring the power lines to see if there is a short (5V to ground, 12V to ground and I think there are 24V lines?). Maybe look for burst or burned capacitors and if you’re crafty and able to solder replace them. Otherwise replace the MB or defect parts.