PC won't turn on.

[Armand1709]

My PC won't turn on after it shutdown by itself.I already checked the power supply it is working perfectly.I don't know what else to do with it.

Update
The USB hub and the fan is lighting up but the screen is still blank.

 

[Barney6262]

Hi. Try unplugging at the wall. Holding the PC power button down for 15 seconds then re-plugging and trying again.
If that doesn't work try clearing the CMOS by removing the large silver battery on the motherboard for 10 minutes (while the pc is off and unplugged) then replacing it and trying again.

May I ask how you know the psu is working?

EDIT: to clarify is this a laptop or desktop?

 

[price_th]

How did you determine you PSU is working?

 

[Armand1709]

I check the psu by connecting it to another pc.
Im using a laptop.

 

[Barney6262]

By the PSU do you mean the power cable?

 

[Armand1709]

My pc is now can be open i just removed the battery and connet the charger to another plug!Thanks for answering btw