I can't turn off mute on my mac.

My computer seems to be on mute and cannot turn it off. Its gray and does not give me the opion neither in the task batt or in systme preferences to turn it off. Already tried command PR and nothing...any suggesstions????
Thanks

Under the Apple in "About this Mac" > "More Info..." does your system recognise the sound card? Have you tried an SMC Reset?
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.

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