I was watching a movie when the power outage occurred. When the power come back, my computer wont turn on. When I turn on the PSU switch in the back, the light at the PSU was green. When i turn on the power button in the front there is nothing happen, no fan sound from the PSU, no beep. I tried the paper clip test on the PSU and the fan was spinning fine. The LED light on the motherboard was there. How could i turn it on and what is the problem here?
If your MOBO wasn't power-surge protected and you didn't have an UPS, then it likely could be a component that has been damaged. It's hard knowing wether it's the PSU or it's the GPU, the RAM or whatever component it might be.
If you have some spare parts, then you could systemitcally try replacing one at a time and find the component that might cause the problem.
However the best way for you is simply to get the PC to a proffesional, who can determine the problem and possibly switch the component.