Troubleshooting the sound system in my Audi A6

My Audi A6's sound system suddenly stopped working. How can I troubleshoot and fix this issue?

First, check if all the speakers are properly connected and if any cables have come loose. If that doesn't solve the issue, try resetting the sound system by disconnecting the car battery for a few minutes and then reconnecting it. If the problem persists, it may be a faulty amplifier or head unit that needs to be replaced.