If your nuvi 755T, 765T, 775T, or 785T displayed the message "Updating GPS firmware" or "GPS Update Complete" and now will no longer power on when plugged into a computer, a home charger, or a car charger, your nuvi will require service to correct this issue. Please visit the following link to contact Garmin Customer Support in order to request service on your device:
Please Note: If your unit will power on when using battery power, or when plugged into a computer, a home charger, or a car charger. A software update is now available to correct this issue. Please use our WebUpdater program to install this update onto your nuvi.