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i don't have a 5455... but on my 2210, the ac adapter can be plugged straight in to the unit... try plugging it straight in, no cradle, and see if it charges. If it doesn't, something's probably a little messed up, and I would try a hard reset if you can't figure it out (unless somebody has an easy fix). If it does charge, something's futzy with the cradle settings, most likely...
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