PC wont power on. PSU issue

dehorn

Honorable
Jan 21, 2014
5
0
10,510
hello,

ill keep this general unless more details are needed. my brothers pc randomly stopped booting up. when you hit the power button, nothing happens. so my first thought was that the PSU died. i swapped his 300w unit out with an old 200w unit and it boots. then i put his 300w unit in another machine and it boots fine.

so why would this happen?
 
Do you regularly clean the dust out of the computers?
It could be the old one got clogged and moving it out helped, get some compressed air and take the case outside and blow all the dust away, and try it again.
PSUs also degrade over time, it could be it's not supplying 300W like it's supposed to