How to detect only if back button is pressed?

My psp won't detect my umd!?

Hey, my psp won't detect my umd and no, i didn't drop it. Last night i was playing a game just fine and then i pressed the home button to go home then i put it to sleep mode. ...show more
Answer:

I think i know what the problem is you know that lens inside the umd door its probly smuged up now you have to send it in to sony for $90 if you don't have a good warranty.

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