Hello. My name is*****'m sorry that you are having this problem. it would be my pleasure to assist you with this. Can you tell me please if you are seeing any error messages on the screen when you try to turn it on? For instance Loader loading? Did you see a message after the map update indicating that it was successful?
Thank you for that information.If you connect the Nuvi 1690 to your computer via usb, does your computer recognize the device? Do you have a backup of your Nuvi data?
A master rest of the device will fix many problems such as failure to boot.
Note: A master reset will erase all favorites and will restore your device to the default factory settings.
To perform a master reset:
The device will now reset. Follow the on-screen prompts and then place your device in an area with a clear view of the sky until it acquires satellites.
Please let me know how this works for you. If you need clarification on any of the steps or have additional questions I am happy to assist. I am committed to working with you until the problem is fully resolved.
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I am terribly sorry but if the nuvi is recognized by your computer and will not reset, I am out of ideas.