Does keeping a macbook pro plugged in even when fully charged damage the battery in any way?

Does keeping a macbook pro plugged in even when fully charged damage the battery?

no it will not, your battery stops charging when it reaches 100%.  you can verify this if you'd like to through system report - power.
once in a while however, it's best to use it under it's own power and charge it back up once it's down to 75% to keep the battery in optimal condition.

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    Try a SMC reset:
    http://support.apple.com/en-us/HT201295
    If no success, make an appointment at an Apple store genius bar for a FREE evaluation.
    Ciao

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    Software update to 10.6.8 fully?
    Reinstall 10.6 only then Software update fully?
    You can do that by backing up data off the machine and disconnecting, then c boot off the 10.6 disk, just reinstall OS X over the more recent copy, then reboot holding shift key down (precaution) then Software update fully to 10.6.8.
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    run a  hardware test
    https://support.apple.com/kb/ht1509
    For the "D" you need a internet connection previously (don't move if on wifi) and hold that D down for quite some time.

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    I'm having the same problem. It just freezes and wont load the rest of the way.

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    You are still under warranty.  Call Apple Care. Make sure you get a case number as all repairs have an additional 90 days of warranty. 
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    Hi yanksfancvh,
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    Restore iPhone with iTunes on your computer.

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    If your Mac won't turn on - Apple Support
    also free check-up http://www.apple.com/retail/storelist/

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