I would try two things (first make sure the battery is connected):
a) remove the SD card and hit the reset button on the back with a paper clip, then turn it on.
or
b) plug the charger in, and try re-installing the firmware from the SD card with the battery installed and the charger on (this is always the safest approach to flashing the device).
I'm not really hopeful that (a) will work, but the flashing process is usually very robust - so (b) has a good chance of working.
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