I can't use the speakers in my mac pro

dear i am trying to hear from the speakers but nothing i enter system setup and go sound but the speakers are not found so what i have to do ?? only earphones and digital output is working

System Preference > Sound > Output > Internal Speakers
Make sure Mute is not enabled.
If you see red light in the headphone port, plug the headphone
in and out of the port 5 or 6 to flip the microswitch inside.
Sound output may be stuck in the digital mode.
Reset PRAM.  http://support.apple.com/kb/PH4405
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".
Best.

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