In Sound No input and Out Put Device Found

Hi Everyone, I have MacBook Pro (Retina, 15-inch, Mid 2015). Processor 2.2 Quad-Core Intel i7 3Rd Generation.

My problem is that, for the last 2 days am facing a problem with my system. I was working on my system but suddenly Sound not hear, and when I try to press the volume key then, I found that a cut sign on the speaker Icon, and when I try to locate the issue in System Preference then, I found it in Sound Tab that there is no input, no output device. I have tried to shutdown and restart still the same issue. I was using those time Mac OS Monetary. I think that the last update was wrong then. I decided to downgrade OS to Mac OS Big Sur, I have Clean Install Mac OS Big Sur, but the issue still has not been resolved. Today in the morning, I have decided to disamble the system. And when, unplug the battery, clean the board, plug the battery, and press the power on button, I hear the startup sound. But when the system fully booted then, the issue was not resolved. I still see the no input and output device in Sound Preferences. Would you please help me with what I do? I don't understand what's happening, and sound is heard every time I unplug to plug the battery and press the power button for power on the system. Otherwise, I am still facing the issue. I hope you understand my request and am sure you will help me.