Question pc not working

Sep 8, 2020
2
0
10
my pc suddenly doesn't want to turn on i tried different power cords, different outlets nothing works so, i thought the psu was dead so i removed the psu and tried it on another pc and it works!!
also when i plug the pc after leaving it unplugged for a while and i turn the psu switch on the mb lights turn on for less than a second but no fans spin also i tried resetting the cmos and nothing happened and the pc is new it's 3 old so please anyone help.