FIX IT YOUR SELF!!!!!!!!!
don't just take it to those store
they may take apart your PSP and give you one have problem in the hardware
i need to know what did you do to your PSP
here is a webside that help me hack and unbrake my PSP
http://dark-alex.org/index_psp.php
http://www.psp-hacks.com/forums/
you should able to find things you need to fix your PSPin those two web
need to know what did you do to your PSP!!!!!!!!!!!!!!!!!!!!!!!!!!