Audio lost for internal speakers on HP620

I have lost the sound on my HP 620 laptop. In the Audio control and device manager everything looks fine: drivers are visible and it's stated "This device is working correctly". I can see the green gauge in the Volume control moving when I test audio, BUT nothing comes out of the internal speakers.
There are two devices in Audio playback tab:
Speakers/Earphones IDT High Definition Audio CODEC and
Earphones (real time data) IDT High Definition Audio CODEC.
I tried uninstalling the Speakers/Earphones device, downloading the latest driver from HP and installing again, but no luck.
When I connect the laptop to the TV via HDMI the sound works fine.
The only major change I can think of now is a BIOS update which HP Support Assistant did on June 2. The sound problems started before that.
I haver an HP 620 Serial number: {Personal Information Removed}, Product number: WT249EA#UUW, Vista 64 bit.
Hope someone can help, Mikael

Hello MW55, welcome back to the thread!
I was speaking with Joe_Thompson specifically. However, that was only because you hadn't responded to the thread in a while. I can still certainly try to help you as well!
Microsoft has an online tool for diagnosing audio problems. I suggest you first try that utility to see if it is able to affect your issue. Here is a link to the utility.
How long exactly has your problem been going on? A good next step to take would be to try and perform a Microsoft System Restore. This will refresh your computer back to a time before the issue began (if you have a date prior to the issue available). This article has instructions for performing a System Restore.
Let me know the results and have a great day!
Please click the white star under my name to give me Kudos as a way to say "Thanks!"
Click the "Accept as Solution" button if I resolve your issue.

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Audio lost for internal speakers on HP620

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