My psp turn on for one sec then turns off!?

Well, i got my psp phat 4 years ago i think. I found it today and then i fixed it with pandora and magic memory stick that i made. Now when sometimes i turn it on, the green light turns on for one second then it turns off. Also when it turns on, during the XMB [main menu] or in the game, it freezes! then it shuts off. Please answer me and Thanks if u fix it. These are things i have. Regular memorystick 4gig, jigkick battery [homemade pandora], magic memory stick, extended life battery. thats all i have. i have CFW 4.01m33-2... Ty