1995 Z24 chevy cavalier wont even turn over

I have a 1995 Z24 chevy cavalier, I have power to my lights, stereo, and everything else. I turn my key to start the engine, and it clicks twice, and it hums. also, without the key even in the ignition, my alternator is making a quiet buzzing noise. 

Obviously the alternator is running to earth inside ,could be a rectifier diode .change alternator and recharge battery

not enough power to throw solenoid in on the starter motor because the alternator has drained it .leave car a bit longer and nothing will work .disconnect battery now to stop it draining further and to avoid a possible fire risk.

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