Why your computer shutting down on its own?

Answer 1

if your computer runs for a while then shuts down, this is often a lack of power to the system. Try removing anything you can live without (modem card if you use ethernet, soundcard, extra fans) and see if will work then. Most likely this won't work but its worth a shot as the only other alternative if it is a lack of power, is to buy a new PSU will will run you around $100-$200 and is the most difficult piece to install in a computer.

Also you can use a tool to diagnose whether it is a software problem, try ErrorFix. http://www.make-pc-faster.com/

Answer 2

This question is not specific enough for anyone to provide an accurate answer. However I will list a few possible causes for this problem, and their respective solutions.

Problem: New hardware interfering with the operating system.

Solution: Reinstall OS

Problem: Incompatible hardware

Solution: Check your hardware's compatibility by reading the included manual.

Problem: Virus

Solution: You may have to buy a new computer or hard drive, but make sure you have internet security.

Answer 3

It could be overheated, there could also be a computer virus infecting the server thus shutting it off. If you want to surf safely in the web, get an antivirus total protection