sometimes pc reboot

Berk__

Commendable
Aug 27, 2016
2
0
1,510
first of all ı dont have very good english so sorry about that:D
my pc started rebooting itself.while playing gmes(LoL,Overwatch etc.)or browsing even while writing my computer password(after start windows 10 asks for pw)it tries to start again,%90 of the time screen is black(while case,fans everything is running)

PC SPECS:
Operating System: Windows 10 Home Single Language 64-bit (10.0, Build 14393)
Processor: Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz (4 CPUs), ~3.2GHz
Memory: 8192MB RAM
Card name: NVIDIA GeForce GT 630
Display Memory: 6070 MB
Dedicated Memory: 1999 MB
Shared Memory: 4070 MB
Current Mode: 1920 x 1080 (32 bit) (60Hz)

there was no problem ntill last year or 1.5 years ago.(pc probbly 5 or 6.5 years old at the moment)
I NEED HELP PLS :((