Computer randomly stopped working

[Juffury]

My PC has been fine for a couple months, today after coming home from work, I turn it on and the power light stays on, but on the inside of my computer, no fans are spinning, the heat sink started up and stopped immediately, my GPU lit up and then stopped immediately. What's happening?

 

[PhysX_HW]

First, unplug it from the wall, wait for 30secs, plug it back and try to turn it on as usual. If it doesn't help, check that the cables from the PSU are properly connected to the connectors on the motherboard, the VGA and the hard disks. Also, makes sure that the VGA is properly seated in the pcie slot.

 

[Juffury]

First, unplug it from the wall, wait for 30secs, plug it back and try to turn it on as usual. If it doesn't help, check that the cables from the PSU are properly connected to the connectors on the motherboard, the VGA and the hard disks. Also, makes sure that the VGA is properly seated in the pcie slot.

Already tried, and everything seems to be firmly connected and in The right spots.

 

[PhysX_HW]

First, unplug it from the wall, wait for 30secs, plug it back and try to turn it on as usual. If it doesn't help, check that the cables from the PSU are properly connected to the connectors on the motherboard, the VGA and the hard disks. Also, makes sure that the VGA is properly seated in the pcie slot.

Already tried, and everything seems to be firmly connected and in The right spots.

Then it could be a faulty, well, something. I can't tell what's wrong, but it's most likely the PSU or motherboard.