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OK,
I don't think you can use the video card's HDMI audio to play games. In short I'm not sure it's designed for that.
So... for this purpose, since you have no soundcard, you need to make sure the one on the motherboard is enabled and updated with the latest drivers. Check you motherboard's website to find the latest drivers.
Once you've done that, go to Control Panel, Sound, Playback tab, and make sure the MB's soundcard is set to default. That will ensure your MB souncard is the default soundcard for the system.
Try your games and let us know.
OK, just posted a question at rage3d on using the HDMI port for gaming and my answer came back like this...
HDMI Audio for playing games? - Rage3D Discussion AreaYou can use the ATI HD Audio processor if you are using a HDMI or DisplayPort connection that supports Audio (i.e. no adapters etc. to connect to display).
For Driver, the Catalyst package includes a recent driver, or you can get the latest Realtek driver package from their website (it's a realtek device).
The only problems I've had with ATI HD audio is when having a non-realtek audio solution (like an X-Fi board) installed, Cyberlink PowerDVD 10 won't start until the ATI HD audio is disabled in device manager.
I use ATI HD audio over HDMI for my HTPC and it works great for movies and games (HDMI connection to my HDTV).
In other words, you need to have the HDMI port connected to an HDMI source such as a monitor. If the HDMI source isn't connected to anything, you get no sound.
Also note the driver answer.
Hmmm.... perhaps us english speaking posters should bow out?
To add....
ALL video cards have/has driver issues. You could visit an Nvidia forum and find people screaming just as loud there about drivers. In short, ATI's drivers aren't any worse/better than Nvidia. That's why they have that thing called "Driver Updates"
Anyways, the OP's issue may not even be a video issue. That's still yet to be determined
My .02 cents