In case of sound issues, always start with checking: (1) speakers (2) fuses, in case of total lack of sound (3) sound amplifier (if your car has one) (4) connections leading to the speakers.
Disturbing noise: sound parasites, crackling noise, screeching noise after a dead battery / disconnecting the battery / replacing the battery.
If you don’t have a separate sound amplifier module, then the lack of sound is likely caused by the CCC iDrive. If these graphical anomalies appear at the same time as the CCC iDrive reboots, then the strange lines on the screen are most likely caused by a faulty CCC, not by a faulty display.
You sometimes see graphical disturbances (horizontal and vertical lines) on the screen.
The less common symptoms of a BMW CCC failure:
The CCC console buttons lights remain always on.
The iDrive sat nav does not eject the CD / DVD anymore when pressing the Eject button.
The cooling fan of the CCC iDrive remains on, consequently draining the car battery.
No navigation functions can be controlled from iDrive controller anymore.
The CCC iDrive is completely non functional, as a result your screen remains black.
The CCC head unit functions when the car is cold, but fails to work when the car is warm.
The iDrive is fully functional on some days, but fails to boot successfully on other days, most likely when the weather is warmer.
The CCC iDrive does not boot completely: when started, it remains stuck on the BMW logo.
CCC iDrive reset: the CCC head unit reboots continuously, as a result your screen cycles between the BMW logo and a black screen.
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