There are several troubleshooting steps you can do to solve this problem:
1) Check the connection to your computer's audio card jacks to make sure they are plugged into the right jack (A very common problem)
2)Go into device manager (In windows go to Control Panel - System-Hardware-device manager. Go through the list and look for Sound, Video, Game controllers. If nothing is listed, or if there is a yellow triangle next to any of the audio devices, reinstall the audio drivers for the computer's sound card. If the devices are indicated, with no indicators of driver issues then go to step 3
3)If your sound card has it's own utilities, there should be an icon in the system tray (Lower right hand side of the screen). Click on that, bring up the utility and check and see if mute is selected. If you don't have a utility such as that installed, there should be a little speaker icon indicating windows audio drivers. Click on that and check and see if mute is selected.
These steps should correct the problem. However if the problem persists, reinstall your audio drivers. Check again in device manager to see if your audio device is indicated. If it is, then your speakers may be defective.
Answers & Comments
There are several troubleshooting steps you can do to solve this problem:
1) Check the connection to your computer's audio card jacks to make sure they are plugged into the right jack (A very common problem)
2)Go into device manager (In windows go to Control Panel - System-Hardware-device manager. Go through the list and look for Sound, Video, Game controllers. If nothing is listed, or if there is a yellow triangle next to any of the audio devices, reinstall the audio drivers for the computer's sound card. If the devices are indicated, with no indicators of driver issues then go to step 3
3)If your sound card has it's own utilities, there should be an icon in the system tray (Lower right hand side of the screen). Click on that, bring up the utility and check and see if mute is selected. If you don't have a utility such as that installed, there should be a little speaker icon indicating windows audio drivers. Click on that and check and see if mute is selected.
These steps should correct the problem. However if the problem persists, reinstall your audio drivers. Check again in device manager to see if your audio device is indicated. If it is, then your speakers may be defective.
Good luck!