PSP problems, buttons "Home" depressed / active self

the PSP problems cases, the buttons "Home" depressed / active selfif not the key problem, the possibility is a hardware problem in software or the other like the behind :1. if you have a plugin which crashes? (some darkcheat and several other plugins often cause problems)2. your firmware is wrong. 3. (conslet) konsleting (does your psp have been in places which moist, hit the water, ato fell