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You need to make sure you changed the sound device properly in windows. To do this right click the speaker in the bottom right hand corner of your screen and hit playback devices. Then select the correct device. If you don't know which you can select one and right click and hit "test". Keep trying them until you get sound out of your TV.
If that doesn't work then make sure you have the latest sound drivers. There are two audio drivers on the Gateway website that might work http://global-download.gateway.com/GDFiles/Driver/Audio/Audio_Realtek_22.214.171.12404_Vistax64Vistax86_A.zip?acerid=633675264897204477&Step1=DESKTOP&Step2=LX%20SERIES&Step3=LX6810&OS=ALL&LC=en&BC=GATEWAY&SC=PA_6G and http://global-download.gateway.com/GDFiles/Driver/Audio/HDAudio_nVidia_1.00.0.37_Vistax64Vistax86_A.zip?acerid=633675265145088477&Step1=DESKTOP&Step2=LX%20SERIES&Step3=LX6810&OS=ALL&LC=en&BC=GATEWAY&SC=PA_6G .Try them both and at least one of them should work. You may need to restart your computer after installing the drivers but after that everything should work fine.
Make sure that your computer
and speakers are plugged in, have power and are turned on. If the
speakers are plugged in but don't appear to have any power, plug them
into a different outlet. Some speakers are self powered and use a USB
cable to supply power. Make sure that the USB cable of your speakers is
connected securely to the USB port of your computer.
Retest the sound. If you still
don't have any sound, make sure the cable connecting the speakers to the
computer (known as a 1/8-inch TRS cable) is plugged into the green
audio output jack on the PC.
If you're using self-powered USB
speakers, remove the USB cable and plug it into a different USB port.
If you're using outlet-powered speakers and have a working set handy,
replace the suspected non-working speakers with the working pair to
Navigate to the Microsoft Fix It
automatically detect and fix sound playback or hardware problems. If
that doesn't work, proceed with the next step.
If you have an add-on sound card
and none of the hardware or software fixes helps, you may have to
replace the sound card. If you use on-board sound, it will probably pay
to purchase an inexpensive sound card rather than a new motherboard.
Check the system BIOS to determine whether you have inadvertently
disabled your on-board sound.
Navigate to the "Start" menu and
select the "Control Panel" and "Sounds and Audio Devices." Then click
the "Volume" tab. If everything is grayed out, proceed to Step 7. If the
"Mute" box is checked, uncheck it. In "Device Volume," make sure that
your volume level is set to a comfortable volume level for your
Click the "Sounds" tab. Under
"Sound Scheme," determine whether "No Sounds" is selected. If it is,
click "Sound Schemes." A drop-down list will appear. Select "Windows
Default" as the scheme. To test your sound now, click on a sound listed
below the "Program Events" window. The sounds will be indicated by a
small "Speaker" icon located next to them. Left-click the sound once,
then click the "Play" button. If you still don't hear sound, proceed
with the next step.
Click the "Audio" tab. Under the
"Sound Playback" option, make sure your sound card is selected as the
default playback device. Usually, only one device appears here, unless
you have multiple playback devices installed.
If everything is grayed out, you
either do not have a playback device installed or your drivers are
corrupted and need to be replaced. Drivers help hardware and software
function together. Fix this by reinstalling the appropriate drivers. Do
this by navigating to the "Start" menu and right-clicking "Computer."
Then select "Properties" from the drop-down menu. Click the "Hardware"
tab and then click the "Device Manager" button. The Device Manager will
Look for either a red X or a
yellow question mark listed under "Sound, Video, and Game Controllers."
If a red X appears, right-click the device with the X and select
"Enable" from the pop-up menu. Test your sound at this point. If a
yellow question mark appears, right-click the device, click "Properties"
from the pop-up menu, and then click the "Driver" tab on the window
that appears. Next, click the "Roll Back Driver" button to roll back to
the previous drivers that were functioning correctly. Restart your
computer when prompted.
As a last resort, you can
uninstall and reinstall the device. To do this, right-click the device
and select "Uninstall" from the pop-up menu. Restart your computer.
Windows will automatically detect and install your audio device upon
boot-up. If you still don't hear any sound from your computer speakers,
contact a qualified computer technician.
here is what ION is telling people (short version) this is for vista or win7
1. Visit www.ionaudio.com/ezvc to download the latest EZ Converter software. 2.install new software if needed, 3. connect ION Audio USB. make sure its ON (if it has a switch) Setup Procedure 1.Start thenControl Panel. 2.double-click Hardware and Sound. 3.double-click Sound. 4. At top select Playback tab.choose the audio output device. Don’t chose “speakers-usb audio codec” (that’s your ION) don’t chose modem 5. click Set Default. 6. select Recording tab at top of Sound Control Panel.choose "Microphone – USB Audio Codec" as the default device. (that’s the ION) 7. Click Set Default. 8. click Properties.select Advanced tab 9.set the Default Format setting to 2-channel, 16 bit 44100 Hz (CD Quality). 10. Un-check the two boxes under Exclusive Mode. Click Apply 11. select Levels tab from the top of the Sound Control Panel. 12. Set the level slider to 4. Click Apply, click OK to close the window. Have everything set up and running, ifyou have to call this number for help. 401-658-3743 ext. 1405
If you are running windows XP or Vista and the problem happened recently then you can use the System Restore program to try and take the system back to a date when it was working.
Another thing to try is when the laptop starts up ,the Samsung logo is displayed it should have a message written about to enter Setup press... (press that key to go into setup program).
Look in the sections if there is an onboard Audio section and make sure it's on enabled or auto ,you can change the values by pressing the Enter key when done you must Save and Exit.