The internal speaker option has disappeared in output option

Somehow my volume icon is greyed out in this 2011 iMac 21", after installing my friends new SSD with an older OSX10.6.8, so he can keep running his old Final Cut Pro7. I have no sound, and in system preferences the output option do not even show any internal speakers, but only Digital output and some other options I do not recognize. No sound through headphone jacks either. Maybe my buddie’s SSD with its migrated data settings caused the settings to change? I do have a healthy chime on boot up, so the speakers and the internal amp is operational…Any pointers from the tech gurus on this one?

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