Fans and GPU not receiving power.

[Guest]

So I was up late, minding my own business while downloading some steam games, and bam, my computer randomly restarts. I freak out, but don't think much of it for a few seconds. That is until I notice that the computer is on, it's powered, but no fans are spinning and my graphics card's light that illuminates the GTX 750 isn't on. I'm thinking this could be a motherboard problem, and I'm about to check my connections. Can anyone offer some insight into what this problem probably is?

 

[C12Friedman]

Start by resetting CMOS. With the machine unplugged, remove the watch battery on the motherboard for about 15 seconds then put it back in.
In BIOS there is a setting to allow automatic restart after a shut down event, you can disable that setting which will then cause the system to show a blue screen error when there is an event like that. The blue screen error code can be used to troubleshoot the problem.