How to troubleshoot a malfunctioning radio in an Audi A1?

I recently purchased an Audi A1 and the radio has suddenly stopped working. I've checked the fuse and it seems to be okay. What could be causing this issue and how can I fix it?

First, try resetting the radio by disconnecting the car battery for a few minutes and then reconnecting it. If that doesn't work, it could be an issue with the radio unit itself. In this case, it's best to take your car to a certified mechanic or dealership for further diagnosis and repair.