let the nook run down, then attempt a recharge... if the AC adapter is not working, recharge using a USB port...
then try to power up... you can then try a full recovery: press and hold left and right lower buttons during startup and wait for prompt... press home twice to confirm...
note: i have not done this on my rooted nook; also, you don't say whether or not the Nook's drive(s) appear on your computer if plugged in via USB
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