No Sound From Headphone Jack, Only Internal Speakers working in Macbook Pro A1278

Hello, the internal speakers of Macbook Pro A1278 OSX 10.7.5 are working perfectly, but no sound from headphones or external speakers when plugged in. Headphones/speakers recognized when plugged in, shown by System Preferences/Sound, and since the sound stops from internal speakers when headphones/speakers are plugged in. No red light seen coming from headphone jack, as I read in other posts. The problem began after a cable was connected between computer and stereo system. Maybe overloaded the sound card and burned out a connection? Wondering if you think that the sound card needs to be replaced or is there another solution possible? Thank you.

Hello JohnBoarkman,
Welcome to the Apple Support Communities!
I understand that you hear no sound from your accessory when you connect to your headphone jack. My first troubleshooting suggestion for this situation would be resetting the NVRAM on your Mac. Please use the instructions in the attached article to complete this process and let me know if the issue continues. 
How to Reset NVRAM on your Mac - Apple Support
Have a great day,
Joe

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    Hello JohnBoarkman,
    Welcome to the Apple Support Communities!
    I understand that you hear no sound from your accessory when you connect to your headphone jack. My first troubleshooting suggestion for this situation would be resetting the NVRAM on your Mac. Please use the instructions in the attached article to complete this process and let me know if the issue continues. 
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    Have a great day,
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