Vista - Vista HDMI audio Issues

Vista HDMI Issues
Hi,
Im not sure if this is the best place to post my query, but hopefully someone can help
Ive just bought an XPS 1530 with Vista installed, and it seems i cant get any audio via my HDMI port when going to my Yamaha amp. The picture is displaying fine. Also the HDMI audio bar is showing as outputting audio, so it looks like the amp just doesnt like the audio output.
My friend has the very same machine with XP installed rather then Vista and both audio and display are fine via via amplifier.
After doing some research it looks like Vista is outputting 1.3 HDMI audio, and my amplifier (which isnt terribly old), only likes to recieve 1.2.
My question is there any way to tell Vista to output in 1.2, or is there any software/programs that will output the HDMI audio in 1.2 by default?? As my amp cost me €1200 and i would be hoping to not have to upgrade again.
Any advice whatsoever is very much appreciated.
Thanks in advance Guys,
Dave

Hi, superd, and welcome to the forums.

A couple of questions - is this onboard sound or is it a PCI/ PCIe card? Also, have you checked in your BIOS to see if you can switch the type of HDMI signal being sent out of the port?

hi john, thank you.. its a dell xps seen here..
Dell XPS M1530 Laptop

i havnt seen anything in the bios.. anything within vista possibly??
thanks again