computer randomly restarting

[Oniel100]

computer randomly restarts and i don't know why. wasn't like this a few days ago just happened today. sometimes shutsdown.

 

[InvalidError]

Computers suddenly starting to restart is often a PSU issue. You may want to give this a read for one hands-on example of what might be going on when a PSU is acting up:
http://www.tomshardware.com/reviews/psu-repair,4147.html

 

[Oniel100]

your probably right. thought this psu was broken a long time ago but it was working fine for a couple days. must be the psu because it worked fine with my 400 watt