Black Screen while playing games

[alter_arrow]

Can someone please help me? Im at my wits end here. I am trying to finish Metro light Redux but the game keeps crashing my computer to a black screen.
The audio cuts out immediately and there is no loop. My computer leds and fans keep spinning like normal. I have to shut off the PC by holding down the power button
I have tried different gpu drivers for my graphics card.
The only games that I have had this happen to are modded skyrim after hours of play and Metro light redux after a random amount of minutes.
Gpu temperature gets to around 76-80 celsius
Cpu temperature gets to around 67-70 Celsius

Pc Specs:
Intel i5 6500 3.20Ghz
Zotac AMP Extreme Gtx 980 ti
Vengence 8gb ddr3
kentek 850 Watt PSU

 

[ArchitSahu]

That PSU is horrible. It has a really bad rating and bad review. I recommend you switch it ASAP.

There are good lines:
PCPartPicker part list: https://pcpartpicker.com/list/gkvQJx
Price breakdown by merchant: https://pcpartpicker.com/list/gkvQJx/by_merchant/

Power Supply: Corsair - RMx 750W 80+ Gold Certified Fully-Modular ATX Power Supply ($79.98 @ Newegg)
Total: $79.98
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2017-12-30 04:23 EST-0500

 

[alter_arrow]

Okay I bought the Corsair Psu and will update on the state of the black screens when it arrives. Thanks for the quick reply.