Try plugging it in to charge it. If the message comes up that it is charging, I would guess it is a bad power button, in which case call Garmin or take it back to where you bought it.

If the chargin message doesn't come up, then it might be a bad unit and not the button. In which case call Garmin or take it back to where you bought it.

Sounds like I'll be talking to Garmin. Thanks.

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Do or do not there is no try.