I encountred Sound Device Problem

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Jun 25, 2018
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I have dell optplex 745 and i used it for several years fine. but a week ago, i booted it up and everything loaded fine but the sound device was missing. and in windows taskbar the volume icon is marked in red "x" icon. and it says there is no audio device is installed to the computer.
and I tried Driver pack and so many sound drivers like realtek, Intel etc what should I do to solve this problem? my computer is running Windows 7 ultimate 64 bit.
someone help me please??
 
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