I had sound on my computer and its stopped.
I formatted my computer to try a solution and the sound did not return. All the drivers are installed correctly.
I have a cobra AW-850 sound card (AOpen)
but I cannot see it in my device manager. I think that my sound card is not detected.
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If the pitch of the sound being played by your computer speakers has changed dramatically or songs and videos are playing faster or slower than they typically should be, the problem is with the sound speed on your computer. This could mean a hardware issue with your speakers or sound card or a software issue with the program that you're using to play a digital media file.
Double-check your speaker connections. If one of the audio cables that runs off of your speakers isn't plugged correctly into your computer, this could cause the audio coming from them to speed up or slow down. Make sure all cables are properly connected to their proper inputs and try to play your audio again. Update the driver for your computer's sound card. Go to the website of the company that made your sound card and look for your unit's product page. Under the "Support" section, click on the download link for the latest device driver. Once the file is on your computer, double-click on it to install it. Then restart your computer and try to play your audio again. Make sure you haven't accidentally sped up or slowed down the media file you are trying to play. Many digital media programs like iTunes or Windows Media Player have features that allow you to play a song or video in slow or fast motion. If this becomes accidentally selected, the audio will also be in slow or fast motion. Click "Stop" to stop your media file from playing and then click "Play" again to allow it to play normally. Restart your computer. This will free up system memory when your computer restarts. If your sound was playing too slow or too fast due to an error with not having enough memory to play properly, that error will now be fixed and your sound should return to normal speed. Hope this helps.
try swapping the speakers around if the problem still persists either the speaker is faulty or 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 or you might have to clean the dust from your computer dust causes static which causes your computer to overheat and all sorts of problems be sure to wear an anti static earth strap before touching anything inside your computer 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 CPU central processing unit and your SOUND CARD dust causes static to build up in a computer causing it to overheat any many other problems hope this helps
Connect headphones to see if you're getting sound from the unit your connected to. If you get sound then the amp fuse might have blown out or IC is gone bad on the unit. If this is a laptop or desktop reboot the system and see if sound returns. Try updating your sound drivers for your PC.
control panel, go to hardware and sound, click on realtech audio manager with your logitech speakers plugged in, and then you should be able to chose your speaker configuration. If that doesn't work, try going to sound, and configuring your speaker setup there. Realtech has different settings you can click on, including volume, as well as various equalizer settings which you choose if you want to sound like you are in a sadium, bathtub, etc.
It sound a power adapter failure,
check your speakers for power failure, or bad connections,
check also your sound card, mixer, and drivers.
perhaps if a onboard sound is disable for some reason.
check that too.