Help! VGA cable exploded

[wasketsmith]

I just finished building my new pc and before I turned my PSU on I went to plug my VGA cable into a monitor -sparks flew out, melted the ends of the cable and the power went out in my room. I flipped the breakers and everything is ok now but my pc won't turn on or anything.
Can anyone tell me what happened and what I can do to fix my pc?

Edit:
Specs
Motherboard: MSI z370 pc pro
RAM: Corsair Vengeance LPX DDR4 8gb
PSU: Corsair CS650M
CPU: Intel i5-7600k LGA 1151
GPU: Geforce GTX 750ti

 

[Dark Lord of Tech]

Specs?

 

[wasketsmith]

Specs
Motherboard: MSI z370 pc pro
RAM: Corsair Vengeance LPX DDR4 8gb
PSU: Corsair CS650M
CPU: Intel i5-7600k LGA 1151
GPU: Geforce GTX 750ti

 

[thatben]

This happened to me last year on a very old computer, but I don't think the age of the components matters. What happened in my case is the DVI connector was plugged in at an angle instead of straight and it made a couple pins not make adequate contact and that made the PSU explode. I put another PSU in that computer, without changing anything else and the computer was perfectly functional and it still is almost 1 year later.