My computer won't Power On

[ImKrafti]

Yesterday my computer Suddenly just shut off and and I turned it on afterwards and it worked fine but this morning when I try to turn it on all the LED lights are of and the desktop computer will not turn on

 

[Syntax42]

Something went bad. It is difficult to troubleshoot without spare parts to test with. You can ensure your power supply works by shorting the power-on pins to force it to turn on. If you don't know how, I suggest not doing it as you could cause more damage.