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YASBBYM3 is correct. Very likely you are not getting power, so check your cables/connections, and redo them again. Quadlocks can be tricky when closing.
The power/volume button worked on older cars, but not sure if works on the F series.
There is a remote chance that the iDrive firmware got corrupted. If that's the case, there is a slight chance it may recover. Disconnect the battery for 30 mins to couple of hours. Then reconnect and wait couple of hours, or preferably overnight.
If you really want to know what's going on, you need a $10 ENET cable and ISTA+
Or one of the phone app based BMW specific diagnostic setups "may" help you clue in.
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