There may be a malfunction in the touch function of the screen.
If there is a separate touch screen (separate from the computer case) you can first check whether a USB / serial cable is running from the computer to the screen and whether it is still properly connected.
Connect the USB mouse (which is included in the box of the system).
Next click on MENU and then on CALIBRATE TOUCH .
Follow the instructions on screen.
If the above steps did not provide a solution, please contact Eazis.