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I would say this is not a battery problem. A Nuvi will power up even with the internal battery disconnect (done it many times myself ) when connected to an external power source. Please see this link about Dead Nuvi's. Have you tried pressing the reset button behind the antenna?
If the LCD is actually leaking (big stain on the screen) then it cannot be repaired, only replaced.
Replacing an LCD is a relatively simple job on any GPS, it is normally just a case of opening the casing, disconnecting the ribbon cable on the old screen and putting the new one in its place. As long as you are careful and put everything back where you found it then you should have no problems.
You can check all the parts suppliers in your area or online for a new screen, but for the lowest cost solution I would suggest searching ebay for a faulty nuvi 350 with an intact screen. If you can find one you will probably get it for less than the cost of a new part, plus whatever bits you have left you can always resell. There are always people wanting to buy spares for satnavs.
This is a common problem with the Nuvi series. The on/off switch is a surface mount switch that is mounted vertically off of the main PC board.
The problem is, that there is no support behind the switch, so when you press down the button, the solder leads of the switch are stressed and eventually break off the main PC board. This is a design flaw and could have been easily prevented by wedging a small piece of plastic between the rear of the switch and the SD card housing to give the switch support.
Also, the solder pads for the mechanical connections of the switch could have been made bigger, allowing for more surface area and more solder application.
I have repaired many of these before and I'll be posting a step-by-step procedure on how to fix this and prevent it from happening again.
I must point out however, that in order to make this repair, you will need to have skills in dissassembly and soldering.
Also, please only attempt this procedure if your unit is out of warranty.
If you would like for me to repair your GPS, please email me at KS3R at sharc dot net.
Try this: Hold the power buuton down, you will see on the lower screen the word "Pre Booting - ". Keep holding the power button for about 60 second, then you will see on the lower screen "Booting". This time, release power button; system will reboot and loading map... again. I got the same problem, after research on the web. Nick 99990_0 had post this solution on (his Nuvi 660) but it work for my Nuvi 350 too. Good luck.
Dead Battery? That makes no sense at all. He mentioned he was running it off the battery - " I was able to plug it in to a computer and unplug and was able to use it on the battery. Once I unplug and use it on battery, the only way I can power it off is by pressing the Reset button on the back."
The fact of the matter is that there is a well known issue with Nuvi 350 Power switch. I haven't taken mine apart yet (also bad power switch), but most likely the switch is defective or the solder joints are broken.