I need help,i have a firmware 3.4 i was trying to play monster hunter 2 and it asked me to upgrade i accidentaly switched it off. Now for some reason it wont work. When i switch it on a black screen just comes up and then a minute later the psp turns it self off. I don't know how to fix it i cant even use any other buttons or turn it off myself. Please can some one help asap PLEASE!!!!! Thanks in advance.