No sound on HP Pavilion DV7

Question

Our notebook is approx 5 yrs old.  it came with windows Vista with an upgrade to windows 7.  Until about a month ago, we had sound.  now we don't.  When we look at the sound bar and play music, the sound bar goes up and down, but there is no sound.  In our divice manager under audio and sound:  we have : IDT High Def audio Codec and ATI High Def Audio Device, HP Web Cam Splitter.  
When the sound first went out, we just used the computer with no sound.  then all of a sudden, we had sound again.  but short lived.  then it went out again.
I uninstalled the ITD driver and the ATI driver. and when I turned the computer back on, they both reinstalled.  I had read somewhere that if you have windows Vista and you upgrade to windows 7 you need a different audio drivers and I don't know where to get them.  If you think that is the problem............
Can you please help with this.  thanks.
and links to download drivers. 
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Answer 1

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/sp50501-51000/sp5064​2.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.
http://ftp.hp.com/pub/softpaq/sp50501-51000/sp5055​7.exe
When the reinstallation has completed, shutdown the notebook, unplug the AC Adapter and then remove the battery.  Hold down the Power button for 30 seconds.  Re-insert the battery and plug in the AC Adapter.
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 f9 to load the defaults ( this is sometimes f5, 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 ( if the option appears 'greyed out' it will already be set as the default device ) - check if you now have audio.
Regards,
DP-K
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