My macbook pro has stop playing sounds

I have a relatively new macbook pro and the sound isn't working there is no supposed "red light" problem that most seemed to have, the volume icon shows at full and nothing plays, I went into system preferences under sound to check if everything was alright and it was.. my mac is only less than month and hasn't been dropped or damaged in any way...? any help

try to reset the SMC
- turn the computer off and make sure the power is plugged in
- then on the left side of the keyboard, hold down the shift, control, and option keys
- while they are held down, press the power button.
- the computer should not turn on if this is performed correctly.
- after that, let go of everything and turn the computer back on
- also, what applications are you trying to play sound through? Make sure the sound within the app or player is turned up

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