Oh dear, you`ve bricked it!! Give Sony customer support a call 08705 99 88 77 and tell them you updated the latest firmware and the psp turned off and now wont come back on! They`ll send you a reconditioned one and collect yours! If comes with 2.71 firmware and a older circuit board downgrade it to 1.5 then you can play "backed-up" games from the memory card.