If your computer is making Annoying beep, unable to detect what is causing the problem Even with the volume turned off, if your PC has a system speaker, it can still emit a loud system beep.
Try these steps
1. Right-click on My Computer
2. On the Hardware tab, click on [Device Manager]
3. On the “View” menu, select “Show hidden devices”
4. Under “Non-Plug and Play Drivers”, right-click “Beep”
5. Click “Disable”
6. Answer [Yes] when asked if you really want to disable it
7. Answer [No] when asked if you want to reboot
8. Right-click “Beep” again.
9. Click “Properties”
10. On the “Driver” tab, set the Startup type to Disabled
11. Click [Stop]
12. Click [OK]
13. Answer [No] when asked if you want to reboot
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