Audio greyed out after a while

Hi all,
Can't seem to find a definite solution to this. When I keep my iMac on for several days going in to sleep mode every time I leave it for the night I end up with a greyed out speaker icon and thus no sound.
When going into the sound settings and changing between either 'internal speakers' and 'wavtap' it activates the icon again but still no sound. Restarting, unplugging does not help. Plugging in the headphone jack, nothing. out again. nothing.
One time it worked changing. Now it no longer does.
Then strangely enough when typing this message I was still using my itunes and playing a songs and suddenly during a song it suddenly started playing again. Definitely some driver issue.
Anyone a solution that is not about restarting the PRAM?? I mean, there should be plenty of people having this. What is going on? I recently changed to mac it this bugs me a lot.
Thanks guys.

Hi,
Try the following.
Open windows Control Panel, open Windows Update, select 'View update history' in the left hand pane and then select 'Installed updates' link in the following window.
Locate update KB2962407, right click it and select Uninstall.  When done, restart the notebook, open windows Control Panel, open Windows Update and select 'Check for updates'.  You'll see the update you just uninstalled being offered again - right click and select 'Hide Update'.
After this you may or may not need to delete and reload the Audio driver - if you do, the procedure for using recovery manager to reinstall Software and Drivers is detailed in the document on the link below.
Recovery Manager - Windows 8.
Regards,
DP-K
****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
****I don't work for HP****
Microsoft MVP - Windows Experience

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