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To view the state of charge of the battery in your Nuvi 350 hold your finger over the Time Display in the upper right corner on your Menu Screen for 8 to 10 seconds This will put you into an Information Mode the first screen of which starts with:
SWVer 5.10 nuvi1x2GB_2CS
Touch Next 4 times and you get:
Battery Test Page
Batt State Ok Cap
Bat Chrg1mA -198
BatChrg mAhr 1207
Chrg Cycles 3
Connect your unit to your computer with the USB cable, go to Garmin.com and update your software from the "SUPPORT" tab. This should fix you sound problem unless it is caused by a broken speaker. Also see http://www.sharc.net/gps_audio_repair.htm for additional information.
I have the same problem with my Nuvi 350. It's only about 2 months old and the sound went. I turned it on the other day to use it and the sound did not sound right, it sounded like the speaker was blown. I turned it off and turned it back on and that was it, the sound was gone. I did everything possible and can't get the sound to come back. I called Garmin and now I have to send it in for repair. I looked around the web and noticed that Garmins have big issues with the sound going on the units. I hope they fix that issue.