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How to fix missing or lost sound in Windows
https://www.computerhope.com/issues/ch000208.htm#:~:text=1%20Open%20the%20Control%20Panel.%202%20Click%20the,the%20Volume%20option%20and%20a%20speaker%20icon.%20
my Windows 7 audio driver has just disappeared ...
https://answers.microsoft.com/en-us/windows/forum/all/my-windows-7-audio-driver-has-just-disappeared/0906b2d8-a219-4d82-9de4-49bb6c73a3e4
Let’s follow below mentioned steps and check if that helps: Step 1: Run the Audio Troubleshooter You may try running the built in Audio troubleshooter and check if it identifies... Step 2: Uninstall the Audio drivers
Sound disappears in Windows 7 - Microsoft Community
https://answers.microsoft.com/en-us/windows/forum/all/sound-disappears-in-windows-7/f2812fec-f4d6-432b-b7ea-be0f6e304196
The issue could be caused as a result of sound drivers missing from the computer. I’d recommend you to visit the manufacturer’s website and download and install the latest Windows 7 compatible drivers and check if that fixes the issue. Refer the following Microsoft article for more information on updating drivers:
How to fix missing or lost sound in Windows
https://www.computerhope.com/issues/ch000208.htm
If you are missing the Sound, video and game controllers category in Device Manager, your sound card drivers may not be installed properly. Your sound card may also be disabled, malfunctioning, or unavailable. First, verify no conflicts or other devices are present in the Device Manager.
Audio device disappeared - Windows 7 Help Forums
https://www.sevenforums.com/sound-audio/327443-audio-device-disappeared.html
Windows 7: Audio device disappeared. So PC was working perfectly last night, today no sound and speakers are not showing up in playback devices - it says no audio devices installed. Check device manager in Control Panel and its gone from there too. Cant reinstall sound driver as it cant find any supported devices.
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