I've once found this advice on this forum, maybe it helps:
Quote:
Your problem can be a consequence of a deep discharge of the battery. In this case a normal charge cannot be solve. Infact the device must be turn on to charge the battery, but you cannot turn it on to charge the battery...
Try this procedure, it's works on most cases (if the battery is still good)
1) connect to your usual USB power
2) after 10 minutes, press the reset button for AT LEAST 30 seconds. Use a timer to check this minimum time, because 30 seconds are very long!
3) The device must turn on. In not, wait 10 minutes and repeat point 2) It may needs many 10 minutes cycles before starting.
4) when in charge, leave it for almost 6 hours, even the charge led will switch off.
5) before disconnect from power press again the reset just a moment to reboot the device.
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but unfortunately I've only copied the content, not the address of this post. I guess a search through this forum can bring you the help you need.