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According to your problem first check the Audio
configuration from control panel if the configuration become mute and reset it.
If it doesn't help you then uninstall the audio driver and reinstall. You may
have to repair or reinstall the OS, because it may be crashed. You can try to recover
your problem by restore your system through system restore application. If it
can't solve your problem then you have to replace the speaker of your laptop.
2 possibilities to try. #1) download Itunes (new version) and install - make sure you have volume up via keyboard key looks like speaker with rings to right. #2) try reinstalling your OS. It sounds like you deleted a pce of software that corrupted the OS
First of all, make sure Windows Audio and Windows Management Instrumentation Services are running. Steps:
Go to start -> run. If your keyboard has a ‘windows key’, which looks like the windows icon and is often located next to ctrl/alt, you can get away with pressing (and holding) this key, and tapping the ‘r’ key. I use this shortcut almost every day. On that note, windows-key+e I use even more- try it.
type ’services.msc’, without the single quotes. This opens a list of the various services running on your computer.
Make sure iTunes is closed.
Locate “Windows Audio,” and see if it’s running. If it is, the status will show ‘Started’.
No? Well guess what, iTunes needs this to be running in order to communicate with your audio device. Start it. There’s a link to start it along the leftmost column. Once it’s started, find a blank area within the services window, right click and hit refresh. Or just tap F5. Has the service died? If not, skip to step 7.
The service died, didn’t it? Look for a ‘Windows Management Instrumentation’ service. This needs to be running for Windows Audio to be running, even though it’s not listed in the dependancies. Fire it up, then fire up Windows Audio.
You're most likely using a RealTech or sigmatel audio card in your Dell. This is a common issue with this card. Uninstall and reinstall the driver and the issue will go away. Make sure you have the correct version for your OS and get the newest version from your site and you shouldn't have any issues with it happening again.
I had the same problem a few months ago, i also looked to see if i saw a mute function that was active anywhere. I did not find anything so i just reinstalled the application and my problem was fixed. At the link below you can find the realtek audio app. for xp and vista.
go to start, configuration, hardware and see if there is a yellow ! next to your sound device. Ifso, reinstall the drivers. If there is no sound device at all also reinstall the drivers and than restart. Before doing this check if your sound is not muted or set extremely low.