My Sony Ericsson C902 won't turn on

Hello,one nyt i had left my charger at my friends house n
my phone was low on battery....so i decided to charge it with the computer nw its refusing to turn on..What should I do know.,any tips guys

take out the battery and charge it ( kind of boosting it ) with universal charger for 1 or 2 hours then insert it back in phone, connect the charger if you have it and if not try switching on the phone. if this does not work try with another battery and if this still does not work then you have no other choice but to visit a mobile technician near you and your phone will be flashed!.