How to fix a broken power window on an Audi A4?

My Audi A4's power window suddenly stopped working. It won't roll up or down, and I can't hear the motor running when I press the button. What could be causing this issue and how can I fix it?

It's possible that the window's regulator or motor has malfunctioned. This is a common issue with Audi A4s. You can try replacing the regulator first as it's less expensive, but if that doesn't work, the motor may need to be replaced as well.