How to fix an unresponsive radio in Audi 80?

My radio in Audi 80 has suddenly stopped working and is completely unresponsive. What could be the possible reasons for this and how can I fix it?

Check the fuse for the radio. It could be blown and causing the radio to not work. Also, try disconnecting the car's battery for a few minutes and then reconnect. This might reset the system and fix the issue.

Another possible reason could be a loose or disconnected radio antenna. Make sure it is securely connected. If the antenna is damaged, it might need to be replaced.

In some cases, the issue could be with the radio itself. Try replacing the radio unit or taking it to a professional for further diagnosis and repair.