IMac does not unmute

I muted my computer but now I cannot unmute it. The keyboard F10 button does not turn it back on and when I go to System Preferences / Sound, I have no control of the Alert Volume or Output Volume and cannot uncheck the Mute box. I ran the OS X update this morning and do not know if this has anything to do with this. If you have any ideas, I would appreciate your help.
Thanks

Make sure nothing is plugged into the sound output jack. If nothing is try doing resetting both the SMC and PRAM. It will not hurt to do each reset 2x.
SMC RESET
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.
PRAM RESET
Shut down the computer.
Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.

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