you can try and reset it by pressing and holding the lower right corner of the screen, the slide the power switch to the on position till it starts..once it starts, let go of the power button and when you see the screen "do you really want to erase your data, let go of the screen and select yes and follow the instructions.
if that fails, your charger is probably faulty or maybe you just replaced it with a generic one...find another charger to try.
if that fails (i recommend this either way) download the web updater
(HERE) and update the nuvi if you havent already.
normally the charger has gone bad, or a generic charger is the cause
if you need more help, just post back
bill
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