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Hi Mustafa. I'm Greg, 10 years awarded Windows MVP, specializing in Installation, Performance, Troubleshooting and Activation, here to help you.
In the Device Manager what is the driver installed under Sound, Video & Game Controllers for Sound? Realtek should appear there.
If not try installing the Realtek driver from your motherboard downloads in Safe Mode with Networking (so you have internet), or Safe Mode, accessed by one of these methods: https://www.digitalcitizen.life/4-ways-boot-saf...
If not then try installing it from Realtek website:
https://www.realtek.com/en/component/zoo/catego...
If not then here are troubleshooting steps for Realtek drivers:
https://techquack.com/troubleshooting-install-r...
https://www.minitool.com/news/fix-realtek-audio...
https://windowsreport.com/realtek-hd-audio-mana...
(Avoid ad links which intrude into editorial copy, especially avoid Restoro, PC Repair Tool and Reimage ads)
https://www.thewindowsclub.com/download-reinsta...
https://www.youtube.com/watch?v=vPVG3oxppJM
I'll give you all other possible solutions for Sound problems in order of priority, so please try any you've already tried again in order. If you have any problems performing any steps I'll be standing by here to help you.
- Restore the Windows Audio Service which may have become disabled: https://troubleshooter.xyz/wiki/fix-audio-servi...
- Next try these checklists:
https://support.microsoft.com/en-US/help/402699...
https://www.howtogeek.com/443702/how-to-fix-sou... - Right click Volume icon in System Tray, choose Sound Settings, from the Output and Input devices dropdown menus, choose then one(s) affected to see if that helps. If not use the Troubleshoot button nearby.
- Run the Playing Sound troubleshooter at Start button > Settings>Update & Security>Troubleshoot.
- Try rolling back the sound drivers in Device Manager reached by right clicking the Start button. Choose Sound controller and other audio devices, then Driver tab, then Roll back if available.
If no newer sound drivers then uninstall the one presently installed in Device Manager, reached by right clicking the Start Button. Restart PC to reinstall.
Try other and older drivers for your model Sound controller, too. For example, try the next oldest driver in the model's online Support Downloads list. To try all previous drivers installed on your system, in Device Manager choose Sound controller's Driver tab, then Update Driver, then Browse, then Let Me Pick.
Finally, try installing the latest Sound driver in Compatibility Mode as shown here:
https://social.technet.microsoft.com/Forums/win...
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.
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