If this doesn't help, the MixMax must be opened up. By CAREFULLY prying the corners loose, you can remove the back. You will break several of the smaller retainer clips during this, but it's OK. The main retainers will hold the unit together just fine once completed. Once opened, unplug the battery. NOTE THE ORIENTATION of the red and black wires. Use any 5V 500ma or less power supply and connect to the battery. Charge it for at least 30 seconds. return the battery to the unit, and reassemble. DO NOT TURN IT ON. Plug the USB cord in and let it charge completely.
The MixMax will disable the power if there is an unexpected power interruption, then the battery will run completely dead. Once dead, it cannot detect the USB when connected.
I encountered a similar problem just recently. something you may try is pressing the reset button with a paper clip or a pin, then try turning it on again.
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