This happens after i've removed my UMD drive without opening the front faceplate. (go through the back UMD door) Everything else works fine.
The + key is not working. But the '-' somehow become "+", and after i've pressed it, it will automatically bring my PSP to the loudest. The only way to get it back down is by using the wired remote.
I've tried change the Powerboard and the "Home, +,-....Select Start" control board. But still no luck.
Anybody can help me?