Power randomly turns off on pc

[trainnsss]

My computer randomly turns off after several hours. It doesn't normally turn off either, my monitor will go black and my keyboard and mouse led's turn off, but my cpu fan and other fans still work and spin. I try just manually turning it off and then on, but sometimes it posts and goes to desktop fine but then turns off again. Other times, I will hit the power button and fans will start spinning then stop. It is very random and I've tried looking everywhere for a fix. I tried the paperclip test, and my psu worked fine except for one black wire which didn't give power. If anyone can please help me! I don't know if it's my psu,mobo, or sdd! It's not my cpu temp because I stay at normal temps, and strangely it feels like my headset gives back a very unnoticeable white noise that gives me a headache (but idk if this is me or the pc). Anyways, please help!

 

[Dark Lord of Tech]

Specs?

 

[trainnsss]

Specs?

MSI - Z97-Gaming 3 ATX LGA1150 Motherboard
Intel - Core i5-4690K 3.5GHz Quad-Core Processor
MSI 750TI
Corsair - CX 600W 80+ Bronze Certified Semi-Modular ATX Power Supply
HyperX 8gb ram
(I use an ssd that I've had but forgot the name since it was a gift but new, intel 223gb)