No Sound in Laptop with Vista op system

My HP laptop lost the sound. When I noticed that my GOM player has no sound, I downloaded some free codecs but did not work. I decided to uninstall/reinstall GOM and codecs.
I did this several times and nothing seems to work. Then I noticed that there is no sound at all in my laptop not just GOM. I also have the Windows Media Player ... but all is quiet. I checked the Device Manager and sound card is working normally ... did not see any ? or ! anywhere. I am not a techie and don't know much about this current technology. That's why I am here to seek help. Thank you.

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Three questions.

1. Do headphones work?
2. Does the sound happen to be muted? You can see in the volume icon, I think.
3. Do the usual Windows sounds work? Easy to check from Control Panel.


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no sound

Answer to all 3 is NO. Just now I played a cd using GOM with headphone and no headphone.
No sound. Volume not muted. No Windows sound.

I tried YouTube before I posted in forum. No sound. And before that there was no problem -
I watched videos, played mp3, mp4 files...

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If nothing apparently wrong ...

the next step might be system recovery back to factory settings using your restore media. If it's a software or setting issue, it will work then. If it doesn't work, you know it's a hardware issue.

Two things to do before:
- It might be worth a try to experiment with a Linux Live CD first. But it's not sure, that would have sound on this laptop, if you didn't try before. But if it does, it's rather sure that that system recovery would work.
- I just answered a post where someone couldn't boot his HP and ran the diagnostics, telling him he had hard drive troubles. Can you run diagnostics for the sound?


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It worked!


I did the audio diagnostics - and just by unchecking the UAC box and rebooted, I got a sound from Windows. So I tried the GOM player and that thing worked too! I did nothing else but uncheck UAC and reboot. Now, should I go back and check the UAC box as it was before?



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