Q: Q: Humming noise

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No warning lights have come on and car runs fine. It recently started making a 'revving' or humming noise when I start the ignition. Noise goes away by 20-30 mph and is intermittent.

Today radio stopped working and car asked me to enter security code.

Not sure if these 2 problems are related and may indicate a more serious problem.

My car has 181000 miles.
My car has an automatic transmission.

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