I have a HP Pavilion a520n.When I turn it on it works for a couple of minutes and then all of a sudden it just kicks off and goes back to the star-up,sometimes it will let me get on windows and sometimes not before it kicks off.But it doesn`t stay on for long at anytime.I have Windows XP 2.I don`t know if it is in the off/on switch or the program itself.I`d appreciate any help with this that you can give me.