Panel & headlights seem bright, but engine clicks and does not turn over

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I went out to start the car this morning in the garage. The brake pedal seemed stiff and the gear shift wanted to lock. I used the manual button to free the gear shift. When I tried to start the car, the panel lights flicker and dimmed and I got a clicking noise. When I turned off the key, there were some addition noises coming from under the hood...