How to troubleshoot a non-functional Audi A8 infotainment system?

I recently bought a pre-owned Audi A8 and everything works perfectly except for the infotainment system. The screen turns on but it does not respond to any touch commands or buttons. How can I troubleshoot and fix this issue?

First, check the fuse for the infotainment system to ensure it is not blown. If that is not the issue, try restarting the system by disconnecting the car's battery for a few minutes and then reconnecting it. If the problem persists, it may be a malfunction in the system itself and you may need to bring it to a dealership for further inspection.

Make sure all the connections to the infotainment system are secure. Loose connections can cause malfunctions in the system. If that doesn't work, try updating the system's software. Sometimes a simple software update can fix any bugs or issues.

If the infotainment system still does not work after checking connections and updating software, it could be a hardware issue. You may need to replace the system entirely or bring it to a professional for repair.