HT2341 why does my sound icon grey out and doesn't allow me to make changes on the system settings

why does my sound icon grey out and doesn't allow me to make changes on the system settings

When you go to System Preferences > Sound what does it say for Output? Have you had headphones plugged in? Sometimes the headphone jack gets stuck thinking it has something plugged in when there isn't anaything there. SMC also has something to do with Sound:
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computers power cable.
Wait another 5 seconds and press the power button to turn on the computer.
The 5 second timing is important to a successful reset.

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