does your computer sleep after a while? mine does
2 things
1. when i plug the wifes storm into the pc at night, the pc goes to sleep, it actually drains the life out of the storm to the point it has to be on the real charger for like 15 minutes for it to come on
2. a usb charge is not a real charge but a conditioning/trickle charge. it may take a LONG time to get a full charge from the usb to pc setup.
leave your phone on the wall charger for a while, it'll wake up
i was doubtful myself, but yes indeed, a std 5 pin mini usb will not sync, just charge.