There is very little which you can fix on this system. As the sound preferences are not showing up I would try resetting the PRAM [https://support.apple.com/en-us/HT204063|Reset NVRAM or PRAM on your Mac] and given the systems age you may need to replace the PRAM battery [guide|3648|.
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There is very little which you can fix on this system. As the sound preferences are not showing up I would try resetting the PRAM [https://support.apple.com/en-us/HT204063|Reset NVRAM or PRAM on your Mac] and given the systems age you may need to replace the PRAM battery [https://www.ifixit.com/Guide/eMac+PRAM+Battery+Replacement/3648]
If that doesn’t work you damaged the DAC logic on your logic board. Which would need a new logic board.
There is very little which you can fix on this system. As the sound preferences are not showing up I would try resetting the PRAM [https://support.apple.com/en-us/HT204063|Reset NVRAM or PRAM on your Mac] and given the systems age you may need to replace the PRAM battery [https://www.ifixit.com/Guide/eMac+PRAM+Battery+Replacement/3648|.
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There is very little which you can fix on this system. As the sound preferences are not showing up I would try resetting the PRAM [https://support.apple.com/en-us/HT204063|Reset NVRAM or PRAM on your Mac] and given the systems age you may need to replace the PRAM battery [guide|3648|.
If that doesn’t work you damaged the DAC logic on your logic board. Which would need a new logic board.
There is very little which you can fix on this system. As the sound preferences are not showing up I would try resetting the PRAM [https://support.apple.com/en-us/HT204063|Reset NVRAM or PRAM on your Mac] and given the systems age you may need to replace the PRAM battery [https://www.macworld.com/article/3284378/how-to-create-a-bootable-macos-mojave-installer-drive.html].
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There is very little which you can fix on this system. As the sound preferences are not showing up I would try resetting the PRAM [https://support.apple.com/en-us/HT204063|Reset NVRAM or PRAM on your Mac] and given the systems age you may need to replace the PRAM battery [https://www.ifixit.com/Guide/eMac+PRAM+Battery+Replacement/3648|.
If that doesn’t work you damaged the DAC logic on your logic board. Which would need a new logic board.
There is very little which you can fix on this system. As the sound preferences are not showing up I would try resetting the PRAM [https://support.apple.com/en-us/HT204063|Reset NVRAM or PRAM on your Mac] and given the systems age you may need to replace the PRAM battery [https://www.macworld.com/article/3284378/how-to-create-a-bootable-macos-mojave-installer-drive.html].
If that doesn’t work you damaged the DAC logic on your logic board. Which would need a new logic board.