Audio stopped playing through my HDMI cable - "HDMI Output" device gone

HP laptop ... Windows 7.  I used to be able to plug my laptop to the TV using HDMI and hear the audio through the TV speakers.  Suddenly one day the audio stopped working, video still works fine.  I'm not aware of any other change that happened around the same time.  No new software.  Windows Updates are happening all the time.

I can hear audio through the laptop speakers.

I tried a different laptop, same HDMI cable.  Audio works fine through the TV speakers using that laptop.

What's the difference between the two laptops?  Control Panel --> Sound --> Playback tab.  The system that works has three devices including "AMD HDMI Output".  The system that doesn't work only has one device - Headphones.

Both machines are receiving Windows Updates automatically.

How did this machine lose its "HDMI Output" device?  and how can we fix it?

Thanks
Dwight BaerStudentAsked:
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Joe Winograd, Fellow&MVEDeveloperCommented:
Hi Dwight,

Look here:

Control Panel
Device Manager
Sound, video and game controllers

Is there an AMD High Definition Audio Device in the laptop that's not working (or any other HD audio device — depends on the hardware)? If so, does it have a yellow exclamation mark? Sounds as if it may be a driver issue. Could be that a Windows update put in a bad driver or maybe it became corrupted. Regards, Joe
Dwight BaerStudentAuthor Commented:
There is  an ATI High Definition Audio Device in Device Manager under Sound, video and game controllers on the machine that doesn't work.  No yellow exclamation mark.
Double-clicking on that device produces "This device is working properly".  The driver is dated 06/05/2010.  Should I try:
- Update Driver?  I tried it, Windows says "Already up to date"
- Roll Back Driver?
- Uninstall driver ... and let Windows reinstall it?

I think I'll try System Restore.
Joe Winograd, Fellow&MVEDeveloperCommented:
> Uninstall driver ... and let Windows reinstall it?

Yes, that would be my first step.

> I think I'll try System Restore.

Also a good idea, but only if you have a Restore Point from when it was working.

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Joe Winograd, Fellow&MVEDeveloperCommented:
Dwight,
That's great news! Regards, Joe
Dwight BaerStudentAuthor Commented:
System Restore fixed it.

It REPORTED that it failed ... it said "No files were changed ... unspecified error".  But then when I checked, now everything works.

Windows.

Thanks.
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