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I woke up this morning and tried to start my car. When I turn the key the car makes a loud humming/grinding noise. Its like it is trying to turn over but won't. Does anyone have an idea what it could be? I took the battery off and tested it thinking that maybe I didn't have enough power to turn the car over. The battery is fully charged.
 

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'05 CTS-V
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What vehicle (year/model) are you dealing with?

Did you actually load test the battery, or just check the voltage? If you only checked the voltage then you didn't really prove that the battery is OK. It can show 12+V on a voltmeter, but when you put a load on it (aka try to start the car) it doesn't have enough power to do anything. Any auto parts store can load test your battery, generally for free.
 
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