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I installed a Yosemite 10.10.5 OS to a Macbook Late 2008 model. The OS works fine except for the Audio. I have tried NVRAM reset and SMC Reset but all failed.

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The chimes sound does play when the OS boots up, but sound is not available to the OS.

I tried to run this command to check if there's a Audio hardware, and it seems there is:

Macs-MacBook:~ Mac$ system_profiler SPAudioDataType
Audio:

    Intel High Definition Audio:

      Audio ID: 63

        Headphone:

          Connection: Combination Output

        Line Input:

          Connection: Combination Input

        Speaker:

          Connection: Internal

        Internal Microphone:

          Connection: Internal

        External Microphone / iPhone Headset:

          Connection: 1/8-Inch Jack

        S/PDIF Optical Digital Audio Output:

          Connection: Combination Output

        S/PDIF Optical Digital Audio Input:

          Connection: Combination Input

    Devices:

What could be wrong? And how can the audio be fixed?

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