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you can try to reset the system by unhooking the car battery for an hour
you can also check all fuses but it is not likely a fuse issue.
usually when this happens the issue is that one of the control modules on the idrive network fails and takes the system offline. It is commonly the main computer, but can sometimes be another module such as the Bluetooth module, amplifier, etc.
to determine the cause, specialized diagnostics needs to be preformed using a bmw diagnostic computer to identify the failed module. Once the module is identified, it can be replaced and the car reprogrammed to accept the new module.
sorry to have potentially bad news but I trust that my honest reply is appreciated.
Please let me know if you have further questions. Please do not forget to click a positive rating as this is the only way I receive credit for my answer, thank you. Best wishes with your vehicle.