How to Fix a Non-Responsive Touch Screen on Garmin NUVI 660 NA?

To address the touchscreen issue on your `NUVI 660 NA`, start by recalibrating the touchscreen. First, ensure the device is turned off and unplugged. Then, slide the power switch to the ON position and hold it for about 45 seconds until you see a message that says "Press Dot." Once this message appears, release the power button and press the center of the dot that appears on the screen. Keep pressing the dot as it moves around until you see a message indicating "Calibration Complete." After that, touch "Ok," and the device will restart. If recalibrating doesn't resolve the issue, the next step is to perform a master reset. Keep in mind that this will erase all waypoints or favorites and restore the device to its factory settings. Start with the unit turned off and unplugged. Touch and hold the lower right corner of the screen with your finger or the eraser end of a pencil. While holding that corner, power the unit on. Once it powers on, release the power button. You should see a message asking if you want to erase all user data. Remove your finger from the screen when this message appears and touch "Yes." The device will reset automatically. After the reset, place your device in an area with a clear view of the sky to help it acquire satellites. If you don’t receive the erase message or the touchscreen remains unresponsive, it’s likely a hardware issue with the screen. In that case, you’ll need to contact Garmin for repair or parts replacement. They can provide you with the necessary instructions for sending your device in for service.