Electronics Repair Questions? Ask an Electronics Technician
The error "HDMI NG" indicates a communication error between your receiver and another device. It can happen for no apparent reason, and the only way to resolve it is to try removing and reconnecting the HDMI cable, turning your devices off and on again, and hopefully the situation will resolve itself. This error mostly occurs on older equipment which does not have as great a compatability with multiple devices as newer equipment.