High Def Audio problems

Hi all, Im really hoping someone can help with this.
I bought a motherboard, graphics card, some memory and a sata2 hdd for my daughters christmas present.
Put it all together and boots up fine but I cannot get any sound.

I have gone through numerous posts on forums and removed the UAA audio driver then the Realtek HDA driverscleaned the registry, booted then reinstalled but no good.
The master volume is not muted and is turned up.
Speakers are ok and I get a crackle when plugging/unplugging them.
The Windows audio service is started and on auto.

In device manager it shows Realtek HDA installed under sound. video and game devices.
MS UAA bus driver for high def (twice) under system devices
and
Other devices>Unknown device with a yellow !
When I do properties on this it shows as - Location 65535 internal high definition audio - the device is not configured correctly - code 1

The Realtek driver also shows as location 65535 but is working ok.

It seems this is a common problem but despite 2 days work I've hit a brick wall.

The motherboard is a Gigabyte GA-EP45-DS3P which comes with a disk which includes Azalia high def codec. I have checked in the BIOS and its on auto.
The UAA driver appears straight away in device manager even after uninstall.
OS is XPSP2

Any help you guys can give would be MUCH appreciated!!