Worst case is you'll have to some how get it repaired or get a new one. But that is the worst case, the best thing to do is do a hard reset or just take out the battery and leave it out for 10 to 30 minutes. The system should reset and the only thing you need to do is reset the time and date. I highly recommend that your friend reformat his memory stick from the psp menu, just make sure he backs-up his save data before doing so.
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