What are the reasons for the sudden failure of BMW audio system?

[Easton]

When the BMW audio system suddenly fails completely, the following issues should be considered: 1. Mute setting: Check if the mute setting is enabled, test whether the radio and CD produce sound. 2. CD player power: Check if the CD player's power supply is normal. The indicator light should be on when powered, and the CD compartment should open and close normally. If there's no power, inspect the power supply, including the fuse box and wiring. 3. Check wiring: If there is power, consider whether it's an aftermarket audio system. If yes, check the aftermarket fuse; if not, inspect whether the audio output wires have come loose. Generally, simultaneous failure of all speakers is unlikely.