Let your car sleep for 20 minutes and see if the computer reboots. The blank screen is a common problem and typically resolves itself after shutting off the car and restarting.
How do I turn my BMW screen back on?
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How do I fix my BMW split screen?
What is the screen in a BMW called?
iDrive is the name given to BMW’s infotainment system, and the scroll wheel wheel used to control it that sits between the two front seats.