I haven't personally had this issue but I've read enough to know that sometimes charging from USB can be an issue for a number of reasons including the fact that some computers go into a sleep mode and will not charge when this happens or because of faulty / unstable USB connections.
Have you a different computer that you can try?
I would also really recommend a wall charger for the Sony - you can get a psp charger which people here have mentioned that they use with success.
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