My computer turns off by itself when on something any help?

My Computer turns off every time I'm doing something like putting security in there and stuff any help will be greatly appreciated

My computer turns off by itself when on something any help?computers

The most probable cause is the computer power supply fan is faulty. Due to this the computer heats up. If the computer is heated up, it automatically restarts or switches off. If you encounter this again, check if the computer is warmer than usual. In that case open the console, dust everything and make sure that the CPU fan is running. If the issue still continues replace the CPU / power supply fan.

My computer turns off by itself when on something any help?hijack this

This kind of problem is usually associated with a bad power supply, which keeps shutting off. Have a computer technician check the power supply and replace it if necessary.
There is a possiblity that your computer may be overheating try shutting your computer off for a while then restarting