How to troubleshoot a malfunctioning radio in an Audi?

I have an Audi A4 and my radio suddenly stopped working. How can I troubleshoot and fix the issue? Any suggestions are appreciated.

Firstly, check the fuse for the radio. If it is blown, replace it and see if the radio turns on again. If not, it could be an issue with the wiring. Check for any loose or damaged wires and repair them if necessary.

Another possibility is an issue with the radio unit itself. If the fuse and wiring seem to be in good condition, try resetting the radio by disconnecting the battery for a few minutes. If that doesn't work, you may need to have the radio unit repaired or replaced.