My Powerbook G4 15inch works well with my external hard drive, iPod, camera, etc. before, but yesterday, when I connected my iPod and external hd, my Powerbook is not recognizing it. My iPod and external HD are not mounting on my PowerBook, but the External HD lights up and the iPod says 'Do Not Disconnect'. So the problem should have to be the USB ports. My PB is connected to a power cord because the battery recently does not work anymore as well, I just purchased it last August, with 13 cycles. I tried resetting PMU and PRAM and it's still not working. I ran Apple Hardware Test and it didn't find anything wrong. I really need help. I need my Powerbook and it's USB capabilities because I have important files in my external hd and I need my iPod as well. Any help would be appreciated.