[VF101hawk]

Check if you have a virus om your computer. i had one that turned mine of every 30 min or so.
Also check the temp on your computer, clean all fans inside it for dust, use compressed air and have a vakume cleaner running as it can contain enourmouse amounts of dust. if you cant simply take it outside that is..

Also tell us what hardware you have and so on. easyer to tell whats wrong then