New power supply, but no power

[jalba]

HI.

My PC was not powering up no matter where I plugged it too. No lights, no startup, nothing.

I bought a new power supply, installed it and the computer turned on good and all was well...till I put it on sleep mode.

When I woke it up, it turned on for a few seconds, then died. Now it's gone back to the same problem.

What is the reason for this?

Jason

 

[Cycloid Torus]

There is no easy answer. The following link gives an orderly approach to finding the problem ( https://www.computerhope.com/issues/ch000312.htm ). The best way is to replace a component with a known good component - the difficulty arises when it is more than one component. If this is suspected the better approach is to do a rebuild starting with the very most basic parts and getting beep codes until a good POST is achieved. This link describes the process ( https://www.computerhope.com/issues/ch000607.htm ).

Download the manual for your motherboard if you do not have it.

 

[jalba]

So to update...

I carried the PC to my repairman. He changed the power supply and cleaned the graphics card, and it's now operational.