PC automatically restarts

[dcet]

What should I do? I think my cpu is sensitive to movement that it suddenly restarts when I move it.. should i buy a new casing? Because my casing is kinda small...

 

[Kurifox]

What should I do? I think my cpu is sensitive to movement that it suddenly restarts when I move it.. should i buy a new casing? Because my casing is kinda small...

I would make sure everything is connected proporly, all power cables inside and outside the case.
I had a problem that my external power cable did not exactly tight fited the power supply, so with a bit of movement it would shut down.
Two laps around the cable with some duct tape solved the problem.