The headphone computer port on your system is controlled by the sound card in your computer. The sound card, in turn, is controlled by a software driver file loaded by the operating system. If your headphone jack stops working, it is likely the result of a corrupted or missing driver file. Reinstall the driver to regain full use of the headphone jack on your sound card. Following are the instructions on how to fix a headphone computer port:
1. Insert the installation disc supplied with your sound card in your optical drive.
2. Click "Start," type "Device Manager" in the "Search" box, and press "Enter".
3. Click the "Sounds" menu and select your sound card.
4. Click "Driver", "Update" and click the drive containing the installation disc to reinstall the driver file.
5. Remove the installation disc from the optical drive and reboot your computer to load the driver file for your sound card.
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