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HDMI audio worked, now not. laptop to HD display-ATI mobility radeon hd 5470

Last response: in Windows 7
February 4, 2013 5:01:24 PM

I've had some issues getting my audio device to recognize my hmdi output and I've researched and it appears it has to do with my video card drivers? Even though I have no problem seeing, just hearing.
I am running into difficulty trying to find out how to get my audio to work again, I've reinstalled my audio drivers, I've rolledback drivers to windows default, and I still can't find the damned hdmi audio output in my sound options.
Help please

a b \ Driver
a b $ Windows 7
February 4, 2013 7:09:06 PM

Install the latest ATI drivers and then ensure that the default audio output is set to HDMI, it doesn't use the internal sound card.