I put the on off switch to lock. Then I prayed and held the switch in the on position for 20 to 30 seconds. Presuming it might be a way of booting the system. Then I switched to off position. Waited couple sec and tried powering on position in Wola!! it came on!!
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I had the same problem with mine and got it working by doing the following while on the phone to Garmin. Plug your charger cord into the device and your computer (do not use a laptop, you need the higher current from a desktop for this). Hold the power button down for as long as it takes for the Garmin logo to display, this could be as much as 1 minute. As soon as the image shows on the screen, release the power button. If your Garmin isn't completely shot you will see it boot up. If you have the Garmin Web Updater program on your computer, run it and update the operating system software to insure you have the latest greatest from Garmin. Once that is done, update your XML data files - they'll be on the list of updates if you need them. Once those are done you can update any voice or language files you'd like. Lastly, leave your GPS plugged in at least an hour or two to give it a charge. Overnight would be better to insure your battery is really well powered up. At this point your Garmin should function normally. The Garmin tech I spoke with told me some units start acting funky when the battery runs down too low and if it's REALLY dead it won't even take a charge or power up when you hook up your charger cord. Try holding the power button for as long as it takes to get a spark & you should be on your way. If not, call Garmin's support number for your locale & they're do their best to get you back up & running again. Cheers, Jeff
With a Nuvi, If a Garmin or Garmin compatible power cord is not used, GPS will stay on the USB Mass Storage mode and will not go to Map Screen even though connector fits fine. In this case GPS can slowly charge. So, you need to find/obtain a power supply that works right.
the battery is defective and needs to be replaced, if the battery is not any good then it won't work even when plugged to an outside power source, that is how this are set up, the battery is not user servicable, u must send it back to Garmin for replacement.
You will need to reset your Nuvi as it is locked into computer mode. To reset it - depending on your version see below.
On some Nuvis there is a recessed master reset button on the body of the unit which you need to access with a nib of a pen or bent paper clip.
For Nuvi 660/680 series
Power off Garmin unit. Press and hold the upper top left corner of screen and then power on the unit by pressing once on the Power button. You should be prompted to clear all user data, or asked if do you really want to start up in maintenance mode. Press “Yes” to reset (warning: all data will be erased and lost, so backup before proceeding) or enter maintenance mode.
For nuvi 200, 250, 360 750, 760 series
Turn off Garmin device. Press down on bottom right corner of the touchscreen, and while holding it power on the GPS unit. You should be prompted whether do you really want to erase all user data, or asked if do you really want to start up in maintenance mode. Press “Yes” to reset (warning: all data will be erased and lost, so backup before proceeding) or enter maintenance mode.
If the above fails it is likely that the problem is not with the Nuvi but the charging unit which is not signalling the unit properly and the Nuvi is recognising it as a USB cable instead of a charger.
Hope this helps. Please remember to rate my answer. Many Thanks.
When you connect the 750 to a computer it goes into data mode and the screen shows only the connected to PC icon. Let it charge for a few hours and then disconnect it from your computer and it will come up in Navigation mode,
Same thing happened to me. Just bought it off Ebay. Had a little charge on it then tried to charge via the car, nothing, then by USB for some hours. Has now turned itself off and can't turn it on. Obviously a dud battery. Ebay seller is yet to get back to me.
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