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This is usually an issue with the Firmware, so I would first like you to do this please.
Remove the power from unit and hold the power button to off for 35 seconds.
Release, then connect the power and try to turn on the Garmin.
Let me know the results please
OK, so when using a different power source it powers on and functions normally?
ok, but when it is not connected to power source, it is functioning correctly?
ok, if you connect it to a different power source then the car, do you get the same issue?