Speaker volume Internal speakers are not working. Sound comes only if there is an external speaker plugged in or headphones. I have checked the speaker section in System Preferences and the MUTE is not checked and the volume is up. In fact, the speaker icon in the top right corner is shaded as if it isn't on. When I use the keys to turn the volume up, there is a small crossed circle under the volume saying that the speakers are not engaged. In the output section of systems preferences there is a choice for DIGITAL OUT, BUILT IN OUTPUT. When I click on it it says that "the selected device has no output controls".

Normally , you would expect the TV sound to stop when headphones are plugged in. Obviously not in this case. If you have a set of headphones, try them and see if the TV still has speakers on. If it does, then there may be a setting on the setup of the TV to get headphones to work. If the TV speakers stop, then I would think that the Logitech are not compatible with the TV. The only other thing would be is to get into the TV and disconnect the TV,s own speakers. If the wires are soldered on and not terminal connected, carefully cut 1 of the wires off near the speaker. If 1 wire is cut, the speaker wont work. Make sure both the TV and the additional speakers (If they have their own power supply) you are using are unplugged from the power before you go doing this...!

Most modern computers come with internal speakers already installed, especially laptop computers.
These speakers may be sufficient if you are performing typical computer tasks, but when you play computer games, listen to music or watch movies on your computer, you may want louder and more vibrant sound.
You can achieve this by installing external speakers or headphones. These can be connected to your computer through the speaker or USB ports included on your computer.

Plug in the speakers or headphones.
If the speakers or headphones use a stereo plug, insert the plug into the speaker/headphone port normally located on the side or front of your computer.
This port is often color-coded green. If the equipment is connected using USB, locate a free USB port.
Some external speakers will also need to be plugged into a power outlet in the wall or your surge protector.
This may be all you need to do to get the speakers or headphones to work. If they do not, continue to the next step.
Open the audio settings on your computer.
From the Windows Start menu, open the Control Panel. Here you will find audio and sound settings.
Click the heading to see your sound and audio options.
Choose "Manage audio devices" in Windows 7.


Find your Playback device.
In the Playback tab, you can select your speakers and set them as the default for your system.
If you do not see your speakers or headphones, they have not been installed properly. Disconnect and reconnect them to see if it corrects the problem.

Configure your settings.
Select your device from the list and click "Configure" to test your settings.
You can adjust the volume by using the volume slider on your computer's task bar or using external controls on the speakers or headphones.


Install speakers
http://www.liutilities.com/how-to/install-speakers-to-a-computer/

Most televisions have a setting that controls whether the TV uses its internal speakers or sends the sound to the audio out jacks for an external amplifier or speakers.
Try going through the settings menu and follow through the audio/speaker selections and confirm that the TV is set to use external speakers.
Best Regards,

Are you plugging the external speakers into the right port? Try plugging them into the Headphone port if there is no external speaker port. Make sure you have the external speakers turned on and the volume turned up. Also make sure you have the software in the computer to have the volume turned up and not muted. Check the audio sound properties and make sure the volume is turned up and not on mute.

Click Start/Control Panel then look for Audio or Sound and check the volume.

You can also click the megaphone at the bottom right near the time to adjust the volume and check for mute.

First, check if you put the connector for external speakers all the way to the end. Sometimes when the connector isn't fully inside both internal and external speakers will work. After you do that, once you connect the external speakers, go to the sound settings in windows and look for the volume mixer. You can regulate the sound for each type of speaker there.

Hello,

Hello,

It is because that your internal speaker is the default play back device other than your head phone or external speaker.

Need to go to your sound setting.

Depend on your operating system, click Start, then click Control panel, then click Hardware and Sound, click Sound.

Under Playback tab, select your external speaker or head phones as default device.

if using XP, go to start control panel , sound and audio devices.Under the audio tab make sure the C Media CM106 sound device is selected under sound playback. Then under the volume tab set the volume somewhere in the middle or at the top if you don;t have active speakers . Then Under Speaker settings advanced, make sure the speaker setup is set to Laptop Stereo speakers. Also make sure the speaker volumes are up on the speaker volume button. click ok. If no result check that the cm106 sound decvice was cemented in as I saw it dissaper when I thought i had slected it. I think the key thing here is the device and the laptop speakers setting.

Go to the system preferences from by clicking the Apple->system preferences menu. check the mute option is on or not. Also check the other options 

Sometimes the headphone jack has its own volume control separate from the internal speakers. Check the levels in the volume mixer.

Connecting headphones to the system will disabled the internal speakers until the headphone jack is disconnected, at which such time the internal speakers should function again.

If you disconnect the headphones and the internal speakers are not re-activated, then there may be damaged to the microswitch in the jack. (Try rebooting after the headphones are disconnected too)