If your device touchscreen is not working, try these troubleshooting activities. If there is a software error, reboot the device. Press and hold the Power button until the device shuts down. Press the Power button to restart. (Note: Any configuration settings not saved as default will be lost.) If the touchscreen is out of calibration, recalibrate the screen. In Advanced settings, touch the Service tab and then touch the Self-tests tab. If the touchscreen lock is activated, unlock the screen. To unlock, touch the Lock icons at the bottom of the screen. To disable the touchscreen lock, touch the Settings tab, touch the Device tab and uncheck Allow display lock timeout. If there is a faulty internal connection, check the connection at J48 on the main board with display flex cable. If a display flex cable is broken, replace the touchscreen and display assembly. If the main board has a faulty touchscreen controller, replace the main board. If the touchscreen has experienced excessive force or prolonged rubbing in one area of the screen, replace the touchscreen.