Solved I can't turn on my PC

Hello!
So, yesterday I was playing Valorant on my PC, then suddenly the electricity went off and my PC forcedly turned off. When the electricity went on again, I tried to turn it on again, but my PC didn't turned on, no LED blinking, no fan rotating, no sound or whatsoever. I checked everything on the motherboard and I thought there's no issue (no bubbled or burnt), I reseat/unplug and plug every thing on the motherboard, still no luck. So I thought again, maybe it's the PSU, I bought a new PSU and tried to turn it on again, still no luck, tried to plug directly to wall socket, nothing happen. So maybe it's the power switch not triggering, so I unplug the power SW pin and use a screwdriver to turn it on manually, but nothing still happen. Help, I ran out of idea. I really wanna repair it by myself before going to computer shop. I'd appreciate your help!

My PC spec:
- Motherboard MSI H410M (Socket 1200)
- Intel core i3 10100F 3.6 GHz Socket 1200
- Memory HyperX DDR4 8GB 2666MHz (x2)
- SSD 240GB SATA
- HDD 1TB SATA
- VGA GeForce GTX 750Ti 4GB DDR5
- Casing GameMax Aero Mini
- 3 Fan Case
- Power Supply Unit Aerocool 500W 80+

I bought a new PSU:
- PSU Armageddon Voltron Bronze 300FX 300-600W 80+

Rustys said:

Assemble the system outside of the case and see if the same thing happens.

Barebone the system make sure that all cables and such are connected securely.

If you have another GPU to see if that may be the issue.

Take it then that there are no fan(s) and or lights powering on even the diagnostic lights.

From the sounds of it the motherboard may be gone.

Is the PSU turning on?

Click to expand...

Turns out the PSU is actually fine (money wasted). I guess it's the motherboard fried from short circuit? I dunno how to check.
Thanks for the answer!