Help pls..My pc keeps restarting itself

Rod_15

Commendable
Mar 13, 2016
2
0
1,510
Processor: Amd Vishera fx-8350
Board: GA 970a - ds3p
RAm: 8gb
Videocard: sapphire r7-240 128 bit ddr3 w/boost
PSU: fortress 700w

I installed windows 7.
when I play videos in VLC and media player it restarts.
when I copy files from my external it restarts.
when I browse something in the internet it restarts



is this a PSU problem ?
graphic cards?
can someone help me out pls.