Hi david4848.
I hope you had a fantastic weekend.
I am glad the hardware tested OK. I understand that the issue still persists though. Here are updated audio drivers that does support Windows 8.1 and your computer. sp59649.exe and sp59620.exe. I suggested trying the sp59649 first, as it is the the most recent, if it should not work, I would try the other one. Here is a document on No Sound from Speakers (Windows 8) that may help.