The role of the audio driver is to establish a good communication between the operating system and the audio system of your computer. If the audio driver is not installed, your computer might not be able to recognize the headphones you plugged in.
In order to resolve this issue, you need to visit the website of your computer's manufacturer and download and install the appropriate drivers.
If you are not sure how to find, download and install drivers, check out the don't know how to download and install drivers guide.
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