SOURCE: Why will my Garmin not sync into my computer?
As one of the Garmin IQUE 3600 owners for so many years, and switched computers many times (yes, I am still actively using it), I would like to share my experience that I had
with this sync problem (palm desktop running, press the sync button, but there is no sync "beep", and
the sync will eventually timed-out).
My problem is solved by "timing" the sync. My set up is that hotsync will run only when the palm desktop is running. So afterI double-clicked the palm desktop icon, the hotsync icon in the system tray will show up first, and then the palm desktop will show up. I observed that if I press the sync button on the cradle right within few seconds after palm desktop shows up, the sync will likely to succeed. If I waited too long, my sync will not work. If it fails, I will exit palm desktop, wait for the hotsync icon to disappear and try it all over again. Good luck.
SOURCE: update problem with Garmin Nuvi 255w
I had same problem. I called Garmin customer service who connected me to a computer rep. Garmin hooks with your computer that you have your Garmin plugged into.They can upload the proper software in no time at all.
The rep told me that after I updated my Garmin I might have turned off the unit before it completed updating the new software. You need to wait until the screen with "Where to?" appears.
It works great now. Prepare to wait on hold for a while. I waited just over an hour on Monday, their busiest day.
SOURCE: Garmin 255W turns on and shuts off
Have you tried resetting the unit.Press and hold the RESET button on the bottom of the nuvi for several seconds,DONT use a ball point pen to do this,use something that wont damage the unit,if this doesnt work,do a hard Reset.Or try rebooting by holding the Power switch on for 15 seconds.Good luck.
SOURCE: 255w in a loop - loading maps, then restarts...can't recharge
Use a USB connection to your computer and let it charge for three hours. Also download updates while your at it. Cigarette lighter charger is not efficient
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