When I plug mine in it says its just "Charging" The menu will still be up. Then I figured out that you have to unplug it real quick then plug it in again. The it will say its charging. But for your problem the best thing to do would be to download the drivers from Sandisks web site. As well as getting the firm ware updates for it.
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If you get an error message "Insufficient power to operate USB device" when you plug a USB device into the computer's USB port or the un-powered USB hub that is attached to the computer's USB port, then this device is drawing excessive current that the USB port cannot supply. The maximum output from an USB port is 500mA. In case such as this, you need to purchased a powered USB hub and connect this hub into the computer's USB port and then connect the USB device into this powered USB hub.
I'm surprised it wouldn't turn on when plugged into external power. That would mean a different problem than a disconnected battery lead ... possibly a disconnected USB port lead, though then I would have expected that you'd be able to turn it on when not plugged in.
I am guessing that the usb hub is not powered. Most usb charing based mp3 players require a certain amount of power in order to be used on the computer or charged by it. I would recommend plugging it into a direct port or buying a powered usb hub.
This message would indicate any one of the following:
1. You have a lot of USB devices plugged in to your computer, and the maximum power supply for the USB ports has been exceeded by plugging this player to your computer. It would be best if you unplugged 1 or 2 of the USB devices connected for the time being.
2. You are plugging the player on your front USB port, and may need to plug it in the rear USB port to acquire ample power supply (front USB ports do not get as much power as the rear USB port -- sad but true)
3. You are using a laptop and may need to try another USB port on that computer. Purchasing a self-powered USB hub would be ideal as it gets its power supply directly from the wall electrical socket.