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It's most likely a loose or dirty battery cable connection. If you bought the car from a private individual, can you talk with them to see if they ever had the problem? If bought from a used car lot, you'll not get much info.
Go to utube and search for "my BMW will not start". You'll probably find 5 to 10 videos.
How do you know a ground cable is missing? Something strange there.
Good Luck & post back here when you find the problem.
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