[SOLVED] Screen turns off, fan loud noise, desktop.

[snanime]

I built my gaming PC a few years ago, it worked fine however lately, every once in a while my screen turns off, fans get really loud and music/sound keeps playing. The weird thing is if I am playing game or watching a youtube video, the sound keeps playing fine through speakers and if I press controller or spacebar, it actually controls whatever media that I was playing, I can hear it. I replaced the CPU thermal paste and no luck, fans and computer is fairly clean, also when I put the computer flat on the table, it usually goes for longer until that problem arises again, what could be causing it?

 

[drivinfast247]

List all components used in your build.

 

[snanime]

Hi, I've included the specs, any help/suggestions will be greatly appreciated

Motherboard:
ASUS z170-A LGA 1151 Intel z170 HMDI SATA 6Gb/s ATX Intel Motherboard

CPU:
Intel i7-6700K CPU @4.00GHz

Graphic Card:
EVGA GeForce GTX 1080 FTW

PCI:
SYBA SI-PEX40108 4 Port SATA III PCI-e 2.0 x1

RAM:
G. Skill TridentZ Series 16GB (2x8gb) 288pin DDR4 SDRAM, total 32 GB

CPU Cooler:
Corsair Hydro Series H100i GTX Extreme Performance

Power:
CORSAIR RMi Series RM859i 850W 80 PLUS Gold

 

[Nemesia]

Try removing your GPU then plug your monitor to your motherboard and use the integrated graphics. If the problem is gone that's your GPU. If it stays it could be your PSU, the monitor or the cable of the monitor.