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This is quite common actually I see it a lot. There really isn't any reason, it seems that when on batteries it trys to save power by Dimming Down, but it often just mucks up.. I always now set it via the keyboard keys. whenever I change from power adapter, to battery.
I spoke to Garmin Support about this issue. There are 2 settings for contrast on the nuvi 1300. You need to set the contrast while it is plugged into the vehicle, and also while it is unplugged from the vehicle. The reason for the 2 settings is to save the charge of the battery while it is not plugged into the vehicle or power source.
On your laptop there should be key combinations to change the brightness of your screen. Once you do this, it will stay that way for each mode until you change it again. There should be in blue above the arrow keys, the F keys, or the number keys, a symbol that indicates brightness; one key for up and one key for down. You press the FN key and that corresponding key to turn your brightness up or down. Once you got it set, leave it. It will stay that way until you change it again.
have you cleaned the screen with cleaner ? cleaners will damage the screen leaving it looking foggy always use screen cleaner and never window cleaner.... also try turning up the brightness level on your unit ...... if you have someone wash your car remember to tell them no window cleaner on the gps
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
Problem solved: I got through to Tech Support. They suggested a 'hard reset', which solved the problem: Put you finger on the lower right screen while you power up and it will do a hard reset---and it will get past the "loading maps" screen, where it had been stuck.