The psp has not been used for a long time,, the boot is the first time to set, in the time and date setting interface, set the time and date, press the X key no response
It's possible that it's a Japanese version of the machine, pressing O is OK. If not, then there may be a problem with the keys, you also said that psp is very long time useless, there may be dust, or long time placed in a dark and humid place moldy reason, suggest that you go to the store to repair the keys, before my psp key blisters are not no reaction, spend 50 repaired