First follow these steps:
1. Make sure all software updates have been
applied.
2. Check in System Preferences: Sound: Output that sound output is set to "Internal Speakers".
3. Use the F12 volume key to set the sound to maximum.
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4. Reset PRAM.
If these steps don't fix the problem then it is a hardware problem and you will need to call tech support at:
1-800-275-2273
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