Envy 15 - No audio able to be heard, despite volume mixer showing activity.

I have a HP ENVY 15 Notebook PC (LW897AV), running Windows 7 Home Premium 64-bit Service Pack 1. It is only a little over a year old as I got it in June 2012, so is still under warranty. Obviously I'd rather not send it back in if I don't have to.
The day before yesterday I was having no issues, as all normal sounds were present (i.e. Windows start-up/shut-down, as well as able to hear mp3 music played on Media Player). Yesterday when I started up all was quiet. I could not hear any system sounds, nor manually force any sounds to be heard. When I look at the volume mixer, I can see the green bar rising and falling (when playing music) so it seems like the sound is being generated but just not being relayed to the internal speakers and/or headphone jacks. Likewise when I open the "Sound" window, my default device is the "Speakers and Headphones, IDT High Definition Audio CODEC", and it shows the same activity on the green verticle bars. I do not use any external speakers.
The audio troubleshooter did not identify any issues. All drivers/etc appear to be running properly with no problems noted. I have not installed any new programs in the recent past (but I honestly don't know if some update occured without my knowledge).
Something similar to this happened to me a couple months ago. Sound randomly disappeared that time too, but came back just as randomly several days later. Now that it has happened again, I would like to not only fix it but determine the cause so it doesn't re-appear again and again in the future.
Any advise or suggestions would be greatly appreciated. And if there is any further information I should provide to give a better view of the situation, just let me know and I'll do my best. Thanks!
This question was solved.
View Solution.

Hi,
Try the following.
Download the IDT Audio installer on the link below and save it to your Downloads folder.
http://ftp.hp.com/pub/softpaq/sp56501-57000/sp56900.exe
When done, open windows Control Panel, open Device Manager and open up Sound, Video and Game Controllers. Right click the IDT device and select Uninstall - you should also get a prompt to remove the current driver, tick the box to allow this and then proceed with the uninstall.
When complete,download and reinstall the Chipset driver on the following link.
Chipset Driver - Windows 7.
When this has completed,shutdown the notebook,
Hold down the Power button and Beats button ( together ) for 10 seconds.
Tap away at the esc key as you start the notebook to launch the Start-up Menu and then select f10 to enter the bios menu. Press f5 to load the defaults ( this is sometimes f9, but the menu at the bottom will show the correct key ), use the arrow keys to select 'Yes' and hit enter. Press f10 to save the setting and again use the arrow keys to select 'Yes' and hit enter.
Let Windows fully load - it will automatically load an audio driver, but just let this complete. Then open your Downloads folder, right click on the IDT installer and select 'Run as Administrator' to start the installation. When this has completed, right click the speaker icon in the Taskbar and select Playback Devices. Left click 'Speakers and Headphones' once to highlight it and then click the Set Default button - check if you now have audio.
Regards,
DP-K
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