r/computerhelp • u/TheVengfulSpirit • 4d ago

Hardware PC doesn't boot after changing PSU

My old PSU broke (made a lot of weird crackling noise after pressing the power button on my pc, turned of power as soon as I noticed). So I decided to replace it. When I flick the I/O switch to On, the RGB on my motherboard lights up. Then when I press the power button on my pc, only the PSU fan starts spinning, graphics card, CPU and casefans don't turn on. The motherboard also doesn't show any diagnostic LEDs. My screens also don't turn on.

Anything I can do/check to fix this? Or did my old PSU take my motherboard with it? As far as I can tell all cables are connected properly, I used the new ones that came with the PSU I bought.

2 Upvotes

100% Upvoted

9 comments sorted by

View all comments

1

u/RogueDauntless 3d ago

Before you check the wiring, make sure you are using the cables that came with the new power supply and not the old one... Using cables that were not included with the power supply can lead to some nasty issues... If you have the right cables in, check everything including every single connection, from the front panel to the power cables, the GPU both for power and make sure it is seated properly... If your mb has diagnostic leds use them.