BMW Questions? Ask a BMW Repair Expert for Answers.
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It's possible that you have a security issue if that light is on or flashing. If that's ok, then there may be a problem with the starter motor or battery cables.
Check your voltages to the starter.
Check the cables for any corrosion.
Turn engine over by hand at the crank to ensure it's free moving.
The battery should be load tested to be sure there is enough cranking voltage, not just enough to turn lights on.
Yes, it can be related to a clutch switch. I don't think it's key or security problem now. Try crossing the starter solenoid with a screwdriver to see if you can get it to crank that was. Make sure there is power to the solenoid from the ignition switch.