Thread: Garmin Zumo 660 not starting up at all

That sounds potentially bad. Not powering on at all might indicate either it's been hard-bricked by an inappropriate firmware flashing or it has a hardware failure. Before giving up, try the following in turn if you haven't already:

1. Check if it's recognised under preboot mode in Windows Device Manager. See here how to access preboot: [Only registered and activated users can see links. ]. Zumo 660 needs to have lower LH corner held to put it in preboot.

2. Take it into a very dark space like a windowless walk-in wardrobe, press the power button to see if the screen shows a very faint light.

3. Hold power button down for at least 30 seconds, release button then press it again to see if that wakes it up.

4. Remove battery and leave it out for several hours to completely drain any residual current from circuits (overnight is usually sufficient).

Hi,

Thanks for this.
The Zumo is in my second home at this time an i am not. I will go there in 2 weeks and try this.
The battery is out of the device now for at least 5 weeks, so it must be drained by now.