The LED on the keypad should start flashing (usually Red/Blue).
This can often be fixed in the Service Menu . Download V56 031 1024x600 Panel USB rar
Since the V56 is a "universal" board, it does not know which screen is connected until you flash the correct software. The LED on the keypad should start flashing
Firmware is typically distributed in .rar or .zip archives containing several .bin files for different resolutions. Download V56 031 1024x600 Panel USB rar
To access the factory settings, press Input + 2580 or Menu + 1147 on the remote. Are you using a 5-key or 7-key button board?