No sound through HDMI

A few days ago, I plugged a HDMI cable into my new laptop and watched a few videos on my HDTV. No problems whatsoever. Since then though, every time I plug in the HDMI cable, the video comes through just fine, but there's no sound. I've found several threads with similar problems, both here and on other sites, but nothing I've found and tried has worked.

Some more details:

Laptop is a HP Pavilion DV6-3141ea
Graphics card ATI Mobility Radeon HD 5470 (Most threads say it's something to do with the graphics but I've still not managed to fix it)

I've updated the drivers for both the graphics card and the sound card (IDT High Definition Audio CODEC). When I plug in the HDMI, nothing changes in my sound settings - the only choices I have are Speakers and Headphones, Independent Headphones, and Speakers (Bluetooth Hands-free Audio). There's no HDMI option or SP/DIF or anything appearing once I plug in the HDMI. I've checked for disconnected and disabled devices too, and it still doesn't show up.

Any advice would be greatly appreciated - I get the distinct feeling this is one of those things that's been staring me in the face the whole time ><'

fireberd said:

If the HDMI is not listed in the Control Panel/Hardware and Sound/Sound Panel playback section. RIGHT click in a blank area in that panel and select show disabled and disconnected devices. If it then displays the HDMI you can then select it as default playback device and you should get HDMI audio. But, if it still does not display that USUALLY indicates a problem with the Video drivers.

Like I said in my original post, I've already checked for disabled and disconnected devices, and updated all my drivers. Still lost :/

Yeah, I updated it from ATI, got the Catalyst software and such. Still nothing.

Did you try another HDMI Cable?
Are there settings in the Catalyst Control Panel?

I solved it - and now I feel a right eedjit. Was looking in the Device Manager, about to follow your advice fireberd, when I noticed there were two identical items called High Definition Audio Controller - one of which was disabled. Enabled, fixed. Unbelievable. I think I missed it since I was only looking in the Sound, video and game controllers section, this was in System Devices. I definitely didn't disable it, which is confusing. No matter, it works now

Thanks for the help guys, it's much appreciated, sorry it turned out to be me being a noob ><

RyuuzakiMasato7 said:

Was looking in the Device Manager, about to follow your advice fireberd, when I noticed there were two identical items called High Definition Audio Controller - one of which was disabled. Enabled, fixed. Unbelievable. I think I missed it since I was only looking in the Sound, video and game controllers section, this was in System Devices.

I know this is an ancient topic, but i just have to say THANK YOU! Ive struggled with this for 5 straight hours now after i had a power breakdown here.. This finally helped me! THANK YOU!

And by commenting on this, hopefully the reply will appear higher on google search for others with the same problem :)