No audio output device is installed is what it says. I have no sound at all

might need to go in a do a system restore to a point before the upgarade

It is either that the device is bad or the driver not instal, first get the driver re-install. if this doest not solve the problem get a new sound Card

You need the sound driver I assume for this laptop. If it doesnt match hardware perfectly then nothing will work.

Go to vendors site with your S/N and Model number to locate the exact sound driver.

Have you checked in control panel / sound speech / sounds & audio devices / click on "sounds" blind and see if any of the sounds can be activated by clicking the big black arrow. If greyed out then the driver is not installed.

What type of computer is this?
If you are building this unit yourself, and your motherboard does not come with audio. Then you must purchase a Sound card. I think Soundblaster is a good choice...Try clicking on sys information and see if you system has Audio. if so then check and make sure you have plugged your speakers in too the right output port, look at the back of the computer its usually the green jack.

Thank you

you need to install a vista driver for your sound card. First check if your sound card is vista compatible

why realtek ac97 audio not being installed in a windows vista?

Check toshiba website for the drivers with your system model..

its a known issue --if you u upgrade vista home to vista ultimate.just u need to uninstall the audio driver and install it again

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.

windows key + R = open : devmgmt.msc
Sounds, video and game controlers > (right click) Realtek high definition audio > update driver sofware > browse my computer for driver software > let me pick from a list...> double click on Realtek high definition audio > YES to update driver warning > AND SWEET SOUND IS AUDIBLE :D