New PSU after PC made Pop Noise

For context my PC had made a loud pop and did not want to turn on after.

I decided to get a new PSU….

Just installed my new PSU.

Plugged PCIE into GPU

Plugged 24 Pin into motherboard

Plugged PCIE into into top left CPU Pin(idk what’s it’s called sorry)

Screwed in PSU to PC Frame

Plugged everything back in to my PC

Turned the switch on

Pressed the power button

And my PC is not turning on.

Anyone know why? I don’t have RGB or a hard drive. I have only one SSD.