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Sometimes we can fix issues like this with a factory reset.. make sure the nuvi is plugged into your computer via its usb cord, and then try the following
Whether this works or not please send a detailed reply so we can continue.
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When you press and hold the power button for a minute.. Does it flash, does it show anything at all on screen?
To get started, I need to know what type of computer you are using, a Windows XP, Vista, Windows 7, Windows 8, Windows 10 or a Mac.If its a Mac, please check the OSX version as follows, Click the apple sign at the top left of your screen, then click about this mac. And then where it says version, send that to me as a reply.
Allright.. One more question.
When you have it plugged in, whether in the truck or to the computer.. Does the charging light on the nuvi come on or flash?
Also, roughly how long have you had the nuvi?
If you have had it for less then three weeks, then my advice is going to be to return it to garmin, who will replace it for you for free. As any steps you and I do next would void your warranty. And since you have a warranty and garmin will replace it for free, thats your best route to go.
Near the bottom of this page it will show you how to return this u nit for a new replacement from garmin