Windows 7: No Audio via HDMI to TV

Hi,

I installed Windows 7 yesterday and at first I had no audio to my TV via the HDMI cable. I adjusted the settings via the sound icon on the taskbar, playback tab, changing whether the speakers or the Digital Output Device (HDMI), Sigmatel High Definition Audio Codec was the default. Eventually I got it to work.

Today, however it has stopped working again and no matter what changes I make, nothing works. When I right click on the playback device Digital Output Device (HDMI) and choose TEST, I get the message: Failed to play test tone. All sound comes through the laptop speakers.

I went to device manager and checked the driver for the codec and it was up to date.

When I was using Vista, to get the audio all I had to do was plug in the HDMI cable and the sound automatically went through the TV.

Does anyone have any ideas how to solve this?

Have you updated your Sound Drivers?

I thought by checking for updates to the Sigmatel High Definition Audio Codec I had checked for the sound drivers. Where else should I check?

You checked these at your Computer Manufacture's website?

Yes, I downloaded all available updates and just now re-installed my sound and video drivers but to no avail.

Try setting the ATI HDMI out as your default audio playback device. Right click speaker icon in system tray near the time, choose playback devices. Right click ATI HDMI to do this.

Yeah I've tried that, it doesn't work.

Try some different ATI display drivers. Some of them aren't outputting HDMI in Windows 7 consistantly.

This has been solved. Thanks for the replies.