No audio output devise is installed.

right and left speaker test working but no audio

What type of laptop HP , ASUS , COMPAQ , ACER ?..........
Up the Volume on My HP Laptop
Open the "Start" menu and click on the "Control Panel" icon.
Locate and open the icon that deals with sound.
Depending on your version of Windows, it will say either "Sounds and Audio Devices" or "Adjust System Volume."
Adjust the volume under the "Speakers" icon.
To do this, click on the slider bar and move it up on the slider.
If you need to decrease the volume, simply move the slider bar down.
Click on "OK" when finished and close the "Control Panel" window.
Click on the speaker icon in the bottom-right corner of the screen for a faster volume adjustment. Simply move the slider bar up to increase the volume and move it back down to decrease the volume.

Volume on an Acer Laptop
Acer laptops are typically sold with pre-installed Windows operating systems that offer sound-adjustment features for increasing the volume on the laptop's built-in stereo speakers.
These same functions can also be used in tandem with external speakers or headphones to increase the volume, as well as mute all sound on the laptop.
If the computer should output an unusually low volume, fixing the problem may be no more involved than sliding a control switch with the computer mouse. Click once on the speaker icon in the taskbar on the lower-right corner to open a rectangular window with a slide control.
Click and hold the left mouse button on the slide control to drag it upward, increasing the volume to the laptop's maximum setting.
Click the "Mixer" button below the slider control to open another window with volume controls for "Speakers" and "Applications," adjusting each slide control upward to increase the volume.
Be sure the speaker icon below each control is not accidentally muted.
Click once on each speaker icon to remove the red circle with a slash through it, which will restore audio.
Click the Microsoft flag or "Start" button in the lower-left corner if the shortcut speaker icon is missing from the taskbar.
Click "Control Panel" to select "Adjust Sounds" from the Hardware and Sounds category.

You can download the audio and device drivers from Dell WEB site, the support download page. Make sure you select your model desktop or laptop, better still, type in the Service Tag number, it is printed on the label on the bottom of the laptop and on the back or sides of a desktop. (If the Service Tag label is missing then go into the BIOS setting and on one of the BIOS pages, the Service Tag number will be displayed). This will open the page where the specific drivers for your model computer are located. Also make sure you select the Windows of the drivers for your Windows operating system. Click on this link to download the drivers: - http://support.dell.com/support/downloads/index.aspx?c=us&l=en&s=gen

nom sound drivers
if your computer came with a motherboard disc the sound drivers could be on it
click start control panel administrive tools computer management device manager scroll to sound,video and game controllers you might see a yellow question exclamation mark? ! or a red X Right click to reinstall drivers
click start control panel sounds and audio,volume,advanced,speakers make sure you have selected the
(((appropriate speakers))) also audio you will find 3 drop down lists make sure you have the correct settings there
also
click start control panel sounds and audio devices select advanced there might be a tick in the mute box untick it
click start control panel sounds and audio devices you can adjust the volume there also select speaker volume you can change your settings there you can also tick in the box place icon in taskbar
if his does not fix the problem

click start control panel sounds and audio,volume,advanced,speakers select the appropriate speakers from the drop down list or navigate to the device manager scroll to system devices + to expand,system speaker right click properties then select use this device (enable) also you might check
the speakers plug/outlet is usually at the back of the computer you will have to open up the computer to check the lead attached to the rear of the input plug make sure the connection is good
try cleaning your computer of dust using a fine air blower from a compressor making VERY sure that there is no MOISTURE in the air line specifically around the sound card and the CPU central processing unit dust causes static to build up in a computer hope this helps

press start key, then control panel look for the speaker or audio icon.then enable the controls. . .
thanks and have a nice day

Hi Jay,


When was this happened, after you've notice that there was No Audio?

Check on the taskbar first, on the lower right corner look for the speaker icon. Check if there is red cross out circle on it. If so, your sound is only muted, Un-check it! Now, If you are using Headset/Monitor try to adjust the volume into higher one(as max as you want) to check if the problem is only on output source/accessories. Or maybe, audio driver was not installed in your computer. Right click your My Computer and hit Properties > Hardware Tab > Device Manager see if theres is Yellow Question mark beside Speaker icon. Then you must update/install the accurate sound driver for your computer.

Thanks

if can not get sound, right click on my computer icon and take properties. then click on hardware from the dialog box, click on device manager. move to sound and click on the + sign beside. if audio controler is highligted in red it means the audio drivers are not installed. installed or update this drivers. if not, click on start, move to control panel and click on sound and audio devices. Check if the volume has been mute.if so, unmute it and you will be able to get your sounds

http://cdgenp01.csd.toshiba.com/content/support/downloads/driver_audio_realtek_os2008015a.exe

download and install this driver...

You'll want to check your Device Manager to verify that it sees a sound card installed. This can be done by right clicking the "My Computer" icon, and selecting manage. Now on the left side, click device manager. Scroll down on the right side to the sound entries. Verify that none of the icons have a yellow exclamation mark next to them. If they do, then windows is having trouble finding drivers or possibly having troubles with another card conflicting with it. If this is the case, then you can go to hp.com (I know you have a compaq, but HP is compaq now), and click search for drivers. Input your computer model number, and locate the audio drivers. Then just reinstall them.

Let me know if I can clarify this any more,

Steven

No Audio Output Device Installed
Some users have been experiencing problems with a "No Audio Output Device Installed" error when trying to play music, or when hovering the mouse over the speaker icon in the system tray. You may get a white X in a red circle to indicate this error.

Go to the device manager by pressing WINDOWS KEY + R to go to the run menu, and then run "devmgmt.msc".


From here, select your malfunctioning audio device(s) and make a note of the driver name. Then, right click on it and select Uninstall. This will remove the audio drivers from your system.


Once this is done, re-load the drivers for your sound card from the CD your manufacturer gave you with your PC or sound device. If you cannot find this, search for the driver on the manufacturers website using the driver name that has been written down. No Audio Output Device Installed
Some users have been experiencing problems with a "No Audio Output Device Installed" error when trying to play music, or when hovering the mouse over the speaker icon in the system tray. You may get a white X in a red circle to indicate this error.

Go to the device manager by pressing WINDOWS KEY + R to go to the run menu, and then run "devmgmt.msc".


From here, select your malfunctioning audio device(s) and make a note of the driver name. Then, right click on it and select Uninstall. This will remove the audio drivers from your system.


Once this is done, re-load the drivers for your sound card from the CD your manufacturer gave you with your PC or sound device. If you cannot find this, search for the driver on the manufacturers website using the driver name that has been written down.