T61 - No sound - Audio Device on High Definition Audio Bus with yellow exclamation mark

Hi,
 I am not sure when it started but suddenly my T61 has no audio/sound. I checked the Device Manager and did see the Audio Device on High Definition Audio Bus with yellow (big) question mark with yellow exclamation mark superimposed on it. I downloaded, from Lenovo Support site, the 7ka114ww.exe , hoping to fix it by un-install that device, reboot it,  and re-install using the download exe file, but to no avail.
 Any suggestion or help is really appreciated. Many thanks in advance
PS. I also see the Base System Device pop up after a reboot and ask to be installed ?!? That pop-up had been there for a while before the audio/sound was lost.
Solved!
Go to Solution.

Hi Maliha,
 I followed your instruction to execute the exe file under C:\Drivers. After that, I rebooted the system and no more error pop up for the missing audio device. I checked the Device Manager and the Audio Device on High Definition Audion Bus disappeared and the SoundMax was shown. But again, still no sound. I clicked on TroubleShooting on that SoundMax and followed that instruction. I found out the default Sound device was erroneously pointed to BlueTooth. I made the change to SoundMax and voila ... the sweet ding sound came back.
 That was a wonderful feeling to be able to fix  this nagging problem that my company HelpDesk could not help me. All thank to this forum and particular Maliha. Again, my appreciation to the valuable help.

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