The volume on my mac doesn't work

I plugged my speakers to my MacBook and then it started to sound blurry so I umplugged them quickly and now it doesn't sound at all. When I try to turn the volume up, and below the little volume squares, is this sign and the little speaker appears gray. I restarted it three times and it stays the same. Please, help me, I'm really worried, my computer is new. Thank you

Hopefully one of these steps should solve the problem.
1. System Preference > Sound > Output > Internal Speakers
    Highlight Internal Speakers / Headphones
    Make sure that Mute is not enabled.
2. Remove the headphone.
    If you see red light in the headphone port, plug the headphone
    in and out of the port 5 or 6 times to flip the microswitch inside.
    Sound output may be stuck in the digital mode.
3. Reset PRAM. http://support.apple.com/kb/PH4405
4. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".
5. Applications > Utilities > Audio MIDI Setup
    Audio Devices window
    Side Bar
    Click the Built-in Output.
    Under Mute any of the boxes checked? If so, uncheck it.
6. If none of these steps is helpful, plug in the headphone and reset SMC.

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Subject:        WP Greek Century in Mac doesn't work with
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The volume on my mac doesn't work

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