Built in microphone option gone from system preferences.

I was having trouble trying to connect my guitar to the mac pro and i had to mess with the sound and the system preferences.
The Built-in microphone option on system preferences is gone. How do i get it back?

Try this Reset and look for it in About this Mac > System Report > Audio
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.
It is the 5 second timing that initiates the reset.

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