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Please help - the touchscreen is working (everything that needs to be on the screen is there.... it goes into the menu options) but nothing is happening if for instants "Home" is pressed - Everything is working fine when I run a command from a pc thru the usb port.
There are two different groups on Facebook that help support the Tevo Little Monster. These are your best choice for getting timely support.
Did you recently try to update? If yes, this will be the problem. If you load the wrong update the display will not communicate properly without config file updates.
The most likely issue is the baud rate setting. In the display settings look for baud rate and make sure it is set to 115200. If this doesn't fix it, turn power off and double check the ribbon cable from the control board to the display is plugged in all the way and is in the correct direction.
Sorry champ, only advice i can give you is to go buy a duet clone & 7" screen kit from aliexpress and convert :)