follow this steps and fix it. GOd bless you
Press the power button. Hold it for 20 seconds to force the unit to shut down.
2
Turn the Tablet back on to determine if it is still frozen.
3
Remove the power adapter or USB cable from the Tablet. Turn it
back off. Turn the Tablet over and remove the screw from the back of the
device. Slide the battery panel off of the Tablet and pull the battery out
of the unit.
4
Connect the Tablet to the power adapter and power it on. The
freezing issue should be fixed and your Table should respond properly.
Reinsert the battery and charge it to full before removing it from
power.
Read more:
http://www.ehow.com/how_8722116_troubleshoot-frozen-nook.html#ixzz2aUBnGy3w
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