HDMI enabled but no sound

It sure is a driver-related problem. I've never had hdmi audio on my monitor with XP and 7 (32bit). I've been trying so hard changing drivers, cables and everything but never succeeded. One day I decide to switch to Windows 7 (64bit) and after the installation there was sound coming from my monitor and I was scared... well... scared but happy to finally have HDMI audio on my monitor

Conclusion : I have HDMI audio on monitor with Microsoft original drivers installed and Nvidia drivers (no need to download Realtek's, it works fine like this and I dont' want to screw up adding drivers I don't need), but only on 64bit OS. I don't even use drivers for my monitor, I left the Microsoft generic monitor driver installed as it works great. Therefore, I'd suggest you try changing your graphic card driver, the latest one or maybe a previous version.

We need to know the name and model of the video card.

Click Start and type msinfo32.exe in the search box then press ENTER.

In the windows that pops up you have to click Display under Components, in the left pane. In the right pane you will see the full name of your card. Sorry if I can't post a pic of where it is but mine is in italian and it might confuse :)

P.S. You should fill out your System Specs, it helps a lot in these cases where someone who's trying to help need info about your machine.

Read here about it ---> Forum Rules

I don't know what an ID number is and listdevices, but it is strange that the driver won't install, it's a forceware you download from the Nvidia site.
When you right-click your desktop, do you have Nvidia Control Panel option? If you have, then maybe you already have it installed and it's the latest one.
If you have that option, then click it and a window will open. There you can click the ? button located in the menu bar and then System Information. You can see the driver version in the right pane, it's the first line. If you have the latest driver it should read 195.62.
It's the driver I'm using and my audio is working.
If you don't have the Nvidia Control Panel then you need to get the driver from the Nvidia site, you will have to fill in the fields and then it will give you access to the driver download, 195.62.


P.S. I don't remember now if you already checked, but are you sure you have a little cable with 2-pins connected to the video card and your motherboard SPDIF/OUT connector? Nvidia cards (8 and 9 Series as far as I know) require you to plug this cable in order to trasmit audio to the video card. This is a must, your monitor needs to recieve audio from your pc and since it is the HDMI cable plugged in, this task is up to your video card.

EDIT :

D'oh! 20 mins writing this reply and you were solving it, I was too late

So, now you can hear audio from your monitor? If that's so, I'm glad I could help :)

No problem, I had the same issue and solved it, I saw this thread and sharing my solution with you was the least I could do