This thread will show you how to self test your Tibo touch screen, this can be a very useful tool to fault find your unit.
1) Insert the SD CARD into the GP5/GP7.
2) Press the RESET button of the GP5/GP7.
Enter Debug Mode
Press ‘Menu Knob Button’ once and ‘Zoom-In Button’ five times of the
device, followed by a pop-up window asking a password. Once inputting ‘3366’ for the password"
Touch Test 
Press on Touch
You will then have to touch on the screen where the x is to align the screen.
If the screen is fine you will get the image to the left, if there is somthing wrong or you where not accurate you will get the message on the right.
If you get the error page please repeat the stages again and see if it resloves the problem if not email
support%@www.totalpda.co.uk.co.uk