On my computer I usually have my ipod's cable plugged in the back of my computer and have it stretch out front but today I was testing out my old mp3 player temporarily so I plugged it into the front then it immediately gave me the dead battery warning then froze so i unplugged it and powered it on again and it worked and reported having half battery left. I tried my ipod on the front and it detects ok but continues to run off the battery power and doesn't indicate any charging. What is going on here?