When I switch On my cell phone it switched off after 2 or 3 minutes and not switched on automatically.

Its may b a battery problem or charging.sometime battery show us full but it do not full because of problem in battery ,u just try someone else battery and check the same will happen or not .or remember try fully charged battery.if its works now try same but uncharged and charged by ur cellphones by this u can what is ur problem ur battery or ur jag( charging slot) and when u know whats ur problem is i hope u can solve it by buying a new battery or change. or one something software may incorrept if u have software u should re install it but before this u should try first two step which i told u. by good luck.