microphone and speakers issue on window 10

[Windows Server]

I am using window 10 on dell laptop my microphone and speakers dont work in that i have reinstalled the window,they starts working after that i have connected my laptop with a dell screen which didnt have audio source and updated all the possible updates showing in the settings and then the microphones and speakers again dont work i also have disable the connected screen on sound settings and set the speakers/handsfree as the default browser it works for a bit but now again no sound nd mic

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