Nuvi is frozen on warning screen. Holding power button for 8 seconds and then longer doesn't reset it.
If you haven't already done so, I would suggest you connect to Garmin.com, register your device, and download/install the WebUpdater.
Then connect your unit to your computer using the USB cable that was included. This will start your unit in a very different mode (it will appear as a storage device to your computer), which WebUpdater will recognize. WebUpdater will check the current release level of your unit's software and let you update it to the latest version. The update process may well cure the problem when next you start the unit in GPS mode.
Good luck.
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