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Doing a soft reset on the nuvi will usually get the nuvi up and running. If there is a reset button on the
bottom, press and hold it until the nuvi powers back on. If it does not
have the reset button on the bottom, slide and hold the power switch to
the left for at least 10 seconds. Also running the Garmin WebUpdater and reloading the latest update will resolve most issues. Download and Install WebUpdater.
If the touch screen of your phone is not responding to touch then it means you have to calibrate the screen to get it working once again.
To calibrate your screen, be sure that the nuvi is properly charged, then you follow the steps below:
Turn off your nuvi,
Press your finger on the upper left corner of the touch screen,
While holding your finger on the touch screen, turn on the nuvi.
Continue to hold your finger on the screen for about 30 seconds until the calibration screen appears(white screen with touch dot),
The touchscreen is intermittent and needs to be replaced. If your unit has a serial # that starts with "12P", "14V" or "143" then you have a style of screen that can fail without physical damage to the screen or glass. Please see this link:
If the Touch Sceen is not responding properly, calibrate the touch screen.. Turn the Nuvi off then back on Slide Power key to the right (lock) Hold your finger on the secrren for 30 seconds until the calibration screen appears Follow the on-screen instructions