No sound, even after reconnecting wires

I have a double din 7in touchscreen radio and I can't get the audio to work I have connected it reconnected the wires several times it comes on you can touch the screen and everything you just can't hear no audio not even a thought from the amplifier any suggestions can you help

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Hi, What is the make and model number of your "double din 7in touchscreen radio" and what is the year, make and model of the car that it is installed in?