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Do you have the AC adapter plugged into a live outlet and have you turned on the speakers? Make sure that the speaker signal cable is plugged into the correct port on your computer (the lime green port on a desktop). Check that the correct audio driver is installed for your computer. (With Windows 8, use the Device Manager to check. From the Start Screen, type in Device Manager. Click on Settings and then select Device Manager. Alternatively, Windows key+C on the desktop. Select Settings and then Control Panel. You can find the Device Manager under System and Security or Hardware and Sound.) Scroll down to the Audio devices. Expand the section and look for a red triangle with an X or a yellow triangle with an exclamation point. Try updating the driver (check with the manufacturer of your computer for the latest driver). Even if you don't see the error triangle, try reinstalling the latest driver.
Next check if the speakers work on another computer. If they don't work, the audio cable may be damaged. Try a different set of computer speakers on your computer. If other known good speakers do not work and the correct audio drivers have been installed, check the audio output devices. Go to the Control Panel > Hardware and Sound page (as described above). Choose Manage Audio Devices. Check if the HDMI port is set as the default audio device. Disable it for a bit (right click on the device) . Sometimes when a new video card is installed, the audio device defaults to this port. This messes up the drivers for the regular audio.) Reboot the computer and then try reinstalling the audio driver. Reboot again. If it still fails, there is probably something wrong with the audio device hardware. If you are using an add-on sound card, try disabling it and using the motherboard audio device. (A number of add-on sound cards didn't work well with Win7 or Win8. The on-board audio drivers worked better.) If you are using the motherboard audio on a desktop, try an add-on sound card. (Check for Windows 8 compatibility (drivers) before selecting any card.)
You don't need a driver for the speakers, but a driver for the sound card installed inside your computer. If the computer came with that sound card then you can find the proper driver from the manyfacturer website -> Support section.
Sound drivers need to be reinstalled sometimes after iTunes updates or video game installs.
you might have to uninstall then reinstall either the driver or the sound devices control panel sounds and audio,volume,advanced,speakers select appropriate speakers or audio you will find 3 drop down lists make the necessary adjustmentsthere or control panel,administrive tools,computer management,device manager,sound,could be a yellow question mark? right click to re-install drivers or right click select properties to either troubleshoot,uninstall,rollback driver hope this helps
Click Control Panel
Click Classic View
Click the Properties tab
Click Device Manager
Expand the "audio" branch of the tree.
Do you see an audio-device? Probably not.
Do you see an "Unknown Devices" branch of the tree?
If so, expand that branch, and double-click the "unknown" device.
Click "Reinstall Driver".
If asked whether you want to search the Internet for the software-driver, click "Yes".
Windows will install the drivers for the "audio device".
Follow the procedure for speaker installation here. Verify it.
As this is a very basic output device, it uses the computer's Audio drivers to channel the sound from each speaker correctly. Make sure that your audio driver is installed and working. Other wise open another ticket and give us info on the sound card
It may not be a problem with the speakers but the the sound drivers of your PC. Verify that your Sound, video and game controller drivers are installed correctly/completely with no yellow or red markings in your Device Manager.
If yes, try to uninstall and re-install using the original CD that came with the motherboard/PC as driver source. Alternately, you can download newer drivers if available.
Hope this be of some idea/help. Post back how things turn up or should you need additional information. Pls include brand/model/version of your PC or motherboard.
Good luck and kind regards.