Unfortunately you don't post your OS version. If Windows 10 then open device manager and expand Sound, video and game controllers. Right click Realteck High Definition Audio then select 'update driver'. Select 'browse my computer for driver software'. Then select 'Let me pick from a list of available drivers on my computer'. In the list showing select 'Realtek High Definition Audio' select the next tab and let it reinstall. You will be asked to 'restart' which means reboot. See if that works.
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