Yes, it is normal. This is the data mode, where you now have access to the unit's internal flash drive. You can update your units map and firmware by registering your unit with Garmin on their website www.garmin.com.
SOURCE: Garmin Nuvi 350 Traffic Receiver connection
You have to power the unit via the mount by either using the cigar charger in the car or snap off the mount from the ball and socket and power it via the mains adapter.
SOURCE: garmin 200w goes into usb mass storage mode when pluged to charge
Steps:
1) Disconnect the nuvi from the charging cable.
2) Press and hold the battery meter icon for 8 seconds. This puts the nuvi into "system test" mode.
3) Plug in the power cable.
4) Click "Exit." The nuvi will reboot, but remain in GPS mode!
SOURCE: garmin nuvi won't turn on
folks, the garmins have an on-board battery that needs to be powered up (at least occasionally) via the usb port - like from your computer. just using the dc car power cord does nothing for this battery. i've had this exact same problem on both my 760 and 780 nuvi units. fixed it using the usb charge. seems to run down differently for all the various nuvi models. my regular charge will hold for 7 hours on my old 660, my 760 and 780 work about 5 hours. my 'power up' failed on the 660 after 10 months with no internal battery charge, but the 7xx models only took about 5-6 months to 'fail.' hope this helps. jack b :-) in midland, tx usa
SOURCE: Garmin Nuvi Doesn't turn on
Try resetting the unit. The procedure can be found here:
http://www.sharc.net/discus/messages/6/313.html?1268661443
- Jim
SOURCE: My Garmin nuvi 780 will
I had the same problem. When you have your nuvi plugged into your cigarette lighter it doesn't charge. Your battery is probaly near dead. I called Garmin and they told me to plug it into my computer via the usb cable. Turn the Garmin off and let it charge for several hours. That did the trick
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