Why does my new macbook pro have no sound?

Suddenly my macbook pro lost all sound. the mute is off and the volume is all the way up. I don't understand. Can anyone help?

Take each of the following steps that you haven't already tried.
1. Start with the steps recommended in this support article.
2. Launch the application "Audio MIDI Setup" by entering the first few letters of its name in a Spotlight search and selecting it in the results (it should be at the top.) Select the Output tab. If the Mute boxes are checked, uncheck them. Move the Volume sliders all the way to the right.
3. If your model has an audio-out (headphone) port, and a red light is coming from it, the internal switch is stuck in the position for digital output. You may be able to free it by inserting and removing a mini-stereo jack of the proper size. Inserting any kind of tool in the port may cause damage that won't be covered by your warranty.
If there's no red light, the switch may still be stuck in the headphone position. Try to free it the same way.
4. Disconnect all wired peripherals except keyboard and mouse, if applicable. If more than one display is connected, disconnect all extra ones. Reboot and test.
5. Boot in safe mode. Don't log in; just reboot as usual when the login screen appears. When you do, make sure the words "Safe Boot" do not appear in the login screen. If they do, the system is still in safe mode and sound won't work.
6. Reset the NVRAM.
7. Reset the SMC.
8. Reinstall OS X after backing up all data. For a possible shortcut, see this thread.
9. Make a "Genius" appointment at an Apple Store.

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