some of my UMDS, where the plastic cover is gets pushed in and then won't work i took it to a game store and they said they couldn't fix it after that i got a pair of sharp tweezers and gently poped it back out. i was just wondering if any of you guys had that same problem
you can always buy a replacement part and fix it yourself or see if you can send it off the sony to get it repaired but im guessing you modded your psp so thats not a good idea than
pushed in UMDs 
Linear Mode
