BMW 650i radio and navigation systems went blank and will not turn back on on BMW 650i

Some BMW 650i owners report experiencing issues with their radio and navigation systems going blank and not turning back on. These problems may stem from a power failure affecting the systems, leading to complete malfunction. Additionally, some owners have encountered glitches in the navigation system, particularly after disconnecting the battery or replacing components like the cabin air filter. Persistent glitches with the CCC iDrive and radio systems while driving have also been reported. Furthermore, intermittent operation of the navigation system can indicate deeper issues. In some cases, clogged drainage lines have been identified as the cause of intermittent radio and speaker functionality, especially after rain or car washes, which may necessitate receiver and amp replacement. To address these issues, owners are advised to perform a soft reset, check the power supply, and consult professionals for further diagnosis if problems persist.