Everyone seems to have this problem, but, no clear cut solution is available.
Machine is HP 2000 laptop, 64 bit, running 8.1
HP site has Realtek HD Audio updates, but audio controller is supplied by Microsoft ( believe it is AMD )
Yellow arrow in Device Manager next to HD Audio Controller and Realtek device does not appear under sound, video controllers.
Hard resets, uninstalling, etc. used to do the trick, but, not anymore.
Any help would be appreciated. Don't want to give up on the old girl, yet.