my psp has been working fine up until a few days ago. my psp won't turn off so i have to take the battery out. then when i put the battery back in the psp won't turn on. so i have to put it in the ac charger without the battery and i have to push the power slide a couple of times. i know that the battery is not faulty because i tried using another battery. i also tried restoring defaults, using another memory stick and i have tried downgrading to 1.5 and upgrading to 2.71 official firmware. can someone please help. how do i fix this problem.