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Power supply damage is most likely and depending on cost of the unit itself may or may not be worth fixing---kind of like hooking a radio up backwards on a 12 volt system--damage is INSTANT and sometimes fatal.
Unfortunately, there isn't an easy solution for the Nuvi owner as it requires a custom piece of firmware to flash the unit to make it at least boot. This problem is often caused during a failed firmware and/or map update.
It sounds like a file was corrupted. Sometimes it is better to connect the unit
up to a PC, delete the old map and then proceed to install the new one. There
are so many issues with memory space causing failed downloads and corrupted
If the map file is missing, the unit will boot-up OK, it will just
say "Map data unavailable" but if the map file or associated map files are
corrupted, it can cause the unit to crash. Your PC won't recognize the Nuvi
because you have the reach the main screen before the data communication mode
routines are accessed.
We've had some success in restoring some of these
units by flashing a "fix" firmware in "pre-boot mode" that doesn't try to load
the map or map associated files. This should then allow the unit to boot. Once
the unit boots, Windows will recognize it and then you can copy a map over to it
from the PC. Reboot the unit and then flash it with the standard
Yes you can restore your data from the TC after a hard reset. You have to go thtrough the setup menu like chose which language etc first. Well I have exactly the same problem as you and a hard reset did not work either ... Upgrading / downgrading the firmware also did not work.... the thing keeps on switching itself on regardless.... Do you have found out something more in the mean time?
All you have tomis manually reboot it, they get froze up like any computer . Turn it off, then when you turn it back.on keep on button depressed while it boots up all the way through the cycle for about 15 seconds , then release, should work fine after that, let me know, thanks Mike
There is a reset button on the 255 i on the bottom right edge as the unit
faces you, and is underneath the serial number sticker. You'll either
have to peel the sticker up for access or poke a hole through it. This should get you going again. I am am also attaching a link to garmin support. Let me know how you made out. Thanks for using FixYa
you need to provide more info. Won't turn on is like saying "you have not slid the on switch to on", or you have not charged the battery, or you don't have power to it. What have you done so far, and has it ever turned on and worked? If it has, when and what happned to not operate anymore?
Check the 12v power cord to make sure its still powering/charging the unit. Usually they have a light on them that will show if its receiving power or not. You can also unscrew the tip of those things (on most cables) and check the fuse to see if its blown. If its not lighting up and the fuse on the cable is ok check the one in your truck to see if it needs replacing.
The update from Garmin seems to have cured the problem!! All I did was the reload.
I've had my Garmin GPS V for almost four years and loved it ... until the dreaded "black line" showed up. I considered replacing the unit but couldn't find anything that would give me the features the GPS V gave me (elevation, ground speed, grade change) and I didn't need a color screen display as an alternative. I'd even bid on a few replacement units on ebay. I was just about ready to bite the bullet, send it in to Garmin and swallow the $125 rebuilt charge when I ran across this thread. After the update it hasn't locked up and as a bonus I have more detail than I had before!