Lost HDMI Audio in Windows 7 on Laptop

Hello,

I have a Sony VAIO VGN-AR390E laptop. It has a SigmaTel High Definition Audio device and an Nvidia 7600 GT. My HDMI audio doesn't work and I have tried for hours today to get it working again. It previously worked just fine in Windows Vista. I am connecting it to an Integra 7.8 receiver which has video pass through via HDMI to my Mitsubishi WD-73737 monitor. I have tried connecting straight through to my TV with no luck in the audio department, and also to someone else's TV with no luck in the audio department. However, a different laptop's HDMI audio worked just fine. The image is displayed correctly though.

Today I tried uninstalling my current nvidia drivers (195.62) from laptopvideo2go and installing 2 different sets of video drivers provided by Sony for my laptop that are a bit dated now. No luck. I uninstalled and re-installed the current audio drivers by Sony. No luck. I also tried the previous version of the audio drivers without joy too. I also installed the Intel chipset drivers too without luck. When I go to the control panel and click sound and properties, I am setting the HDMI/SPDIF output to default and disabling the speakers/headphones option. The speaker icon in the taskbar shows the sound levels going up and down while playing material back- but I can never hear anything. I've tried the 44khz, 48 and 96 options, and Dolby Digital, DTS checked and unchecked and nothing makes a difference when I'm trying to test them. Everything used to work with my receiver except for the WMA Pro option. Now my receiver just says "No Audio Stream Detected" while I'm trying everything. I did have the K-Lite Codec package installed but since deleted it. I also tried messing with the AC3 Filter- and also deleted. No luck there either. I've tried powering down and resetting all of my equipment many times. I'm out of options- any suggestions are very welcome!

NVIDIA Driver - Convert from Desktop to Mobile (Laptop)

Are you trying to say that this will fix the HD Audio problem... and that the laptopvideo2go drivers were the cause?

No, I'm not saying that.

What I'm saying is that since it's not working for you, possibly give that a try since it uses the latest driver possible. Maybe it will help.

Good luck if you do.

Hey, I followed all of your steps and correctly installed the newest nvidia drivers manually. I also re-installed the latest audio drivers from Sony. I still get the picture through HDMI, but zero sound output. HDMI/SPDIF is selected as the default device and the speakers/headphones device is disabled. I tried all the different format outputs with no results. The HDMI cord is fine, another computer and other devices work fine plugged in using it. I'm at a loss as to what to do...

Were you able to get video drivers that acutally work? I can only get the standard vga adapter (that comes with win7) to work. I tried multiple drivers from Sony, and laptopvideo2go, and none seem to give me the full resolution.

I have Windows 64bit, which may be part of the problem. What drivers were you able to get to work for the video?

Thanks.