Glad it seems to be working! A good investment is a PSP charger (again, the barrel type, not USB). The USB into a computer is just not very reliable. Anytime the computer is not 100% on (even screen savers might effect it...) it is discharging! I know you think it was on all night (no sleep, hibernate...etc) but it could still be doing something, but you may not be aware.... or, it could be an older computer and a few of the USB ports are legacy 1.0 instead of the 2.0 needed to charge... whatever it is, glad it's working now..
