You can do one of two things.
1) You can find someone else who has a PSP and has hacked their PSP. There is a Pandora battery out that can unbrick PSPs, but you'll need someone who has the Pandora battery and a copy of whatever firmware you want to use (1.5, 3.5 or whatever). Pandora can restore a bricked PSP. Read here: http://www.qj.net/Noobz-C-D-release-Pandora-s-Battery-unbricker-for-all-PSPs/pg/49/aid/100579
2) Send it in for repair.
Threads of Interest:
The Movie Thread: http://www.vgchartz.com/forum/thread.php?id=6880
The Crow Eating Thread: http://www.vgchartz.com/forum/thread.php?start=0&id=3886
The Betting Thread: http://www.vgchartz.com/forum/thread.php?start=0&id=7104
Custom GIFs Thread: http://www.vgchartz.com/forum/thread.php?id=18963
The Greatest Game Ever Conceived On Any Platform
Tag: "I have tasted Obi-Wan's bitter tears"