You might have PSP stop reading UMD discs,
First you will do some trouble shooting with what might be wrong with your PSP
first is the Disc Spinning motor. This will not let The disc in the
UMD spin. On a working PSP you will hear the disc start to spin up, then you can hear the
laser start to twitch, followed by the laser motor moving the laser down the
something stuck in the UMD gear, try to clean the gear of arm of dust, plastic, soda, and even hair.
and at the last is the actual laser itself. It will not focus the laser to read
the UMD disc.
Hopefully this help, Pls post back should you need additional information...!