How to Fix the Headphones Jack on My Computer

The headphone jack on the computer connects to the sound card, a hardware device that controls audio input and output on the PC. The card contains a digital-to-analog converter that converts analog audio into digital signals and visa-versa. The performance of the headphone jack, therefore, depends on how well the sound card functions; if the card doesn't work, then the headphones connected to the PC won't output sound. Reconfiguring the audio settings will often fix problems with audio output on the headphone jack, but if the former fails to resolve the issue, replacing the sound card in its entirety is sometimes the only means of repair.

Earphones
Test multiple headphones before troubleshooting the card, as the problem could be related to the headphones rather than the jack.
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Step

Click "Start." Enter "sound" into the search box. Select "Sound" from beneath Control Panel.

Step

Double-click "Headphones." If no "Headphones" option is available, double-click "Speakers."

Step

Click "Properties" on the General tab. Check the Device Status field for errors. Look up the message on Microsoft Support for more assistance, if applicable.

Step

Close the window if the Device Status field reads "This Device Is Working Properly." Go to the "Levels" tab.

Step

Click the speaker button to unmute the volume if the icon contains a red circle-backslash symbol. Drag the top slider to the right to increase the headphone volume.

Step

Go to the "Enhancements" tab. Check "Disable all Sound Effects." Go to Applications, and then clear "Allow Applications to Take Exclusive Control of This Device."

Step

Click "OK" to close Headphones Properties or Speakers Properties. Test the audio. If the headphones fail to output sound, unplug the headphones from the computer.

Step

Reconnect the headphones to the PC. Headphone jacks are color-coded lime green on most PCs. Look for the headphones symbol if the jacks are not color-coded. Plug the headphones into the line-out port on the back of the computer if the headphone jack on the front of the PC fails to work, or visa-versa.

Step

Test the headphones. If headphones still won't emit sound, the sound card most likely requires replacement.

Replacing the Sound Card

Step

Shut down the computer. Remove the power cord from the back of the PC. Disconnect the keyboard, mouse, monitor and all other peripheral devices.

Step

Loosen the screws found on the back of the case, then slide the cover panel off of the case. Touch the chassis to protect the hardware from electrostatic discharge, or ESD.

Step

Set the computer on its side. Locate the sound card -- found on the opposite of the audio jacks -- and loosen the screw that secures the card to the computer. If no expansion card is located opposite the jacks, the computer uses an integrated sound card which can't be removed.

Step

Remove the new audio card from its protective packaging. Line up the card with an available expansion slot on the motherboard, then push the card down into the slot to install the new audio jacks. Screw the card to the computer case.

Step

Reassemble the computer. Turn on the PC. Boot in to Windows and insert the CD that came with the new expansion card. Follow the onscreen instructions to install the sound card software to the computer.

Step

Plug the headphones into the new line-out jack.