you don't need to remove it.
try this way:
Connect the Boox to the power for 30 minutes. Then disconnect it for 10 minutes. And then reconnect it again for few hours. One hour after reconnecting your Boox should be able to switch on.
if it doesn't work, you can find instructions about hard reset in this forum:
http://booxusers.com/viewtopic.php?f=7&t=11
regards
brandobras