I cannot hear sound from my computer without the use of a headphone

My Macbook Pro is just over a year old and I am having trouble with the sound and speaker system.
The problem arises when a headphone is plugged in I hear sound, but when they are removed I am not hearing anything and the volume button on the keyboard is inaccessible. There is a circle and a stroke across showing up for the controls.

Is there a red light in the audio output port? If so, the internal switch is stuck. Insert the headphone jack and press the volume key and withdraw the headphone jack. Any difference?
Ciao.

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****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
****I don't work for HP****
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I cannot hear sound from my computer without the use of a headphone

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