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Don't worry that doesn't mean that your mp3 player is faulty, if there is any fault it is from the charger but since the usb charges it well, just continue to use it. It doesn't mean the player is faulty, IT HAPPENS.
Try taking out battery and plug in power. If it works, battery is faulty. If not, Try taking out your hard disk plug in power, if it works, hard disk is faulty. If not, Try taking out memory card, if there's a sound, memory card faulty. If no sound, it's your motherboard that is causing the error.
Note: If machine is under warranty no need to pay for the repairs.
I don't believe this model charges via hooking it up to a computer. I think it has to be plugged into the cigarette lighte of a car, or via an a/c adaptor. I use an a/c adaptor I bought on ebay for my portable cd player. It has a couple of different settings and it just happens that the cd player and the amcor 3900 use the same tip and voltage setting. Of course, after a year of use, my unit no longer locks onto the satellite signal so I am probably going to have to replace mine. Oh well, it worked great up until this week!
Unplug the power cable... Hold the power button down for 15-20 seconds... Plug cable back in and check for light... If this still didnt work, then unplug cable again, take battery out, wait 10 seconds.... Put battery back in, plug cable back in and this should allow you to boot...