Macbook Pro 17" - My built in speakers are not working.

Macbook Pro 17"
My built in speakers are not working.
The speaker logo is not highlighted (grey not Black) and when in sound options "output" pane only displays the digital out for 'optical' - ie, the internal speakers dont register (headphone socket works)
Any ideas?

1. If red light is visible in the headphone port, plug the headphone into and out of the port 5 or 6 times
     to flip the microswitch inside the port. Hopefully that will make the mode revert back to analog from digital.
2. Reset PRAM. http://support.apple.com/kb/PH4405
3. Reset SMC.   http://support.apple.com/kb/HT3964
     Choose the appropriate method.
Hope any one of these steps helps.

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Macbook Pro 17" - My built in speakers are not working.

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