that may be your problem. In general a USB port cannot supply enough power to charge a drained battery. The standard wall charger supplies power of 5 Volts at 850 mAh. Even a high power USB port (while still at 5 Volts) only supplies power at a rate of 500 mAh. In some previous discussions here we worked out that if a charger is rated under 500 mAh it won't always work correctly, but in your situation (basically) the USB cannot supply power quite as fast as the phone would need to charge a drained battery.
As far as copying the pim.vol back to the phone, I believe that you may need resco or something like it to overwrite the current copy (you may be able to do it from the PC, but I'm not sure on that one since I've never tried)
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I'm just sayin'
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