Diag 1B22: errors on D-5000

It's as well I've been playing around with Diagnostics on my recently purchased D-5000, even if there doesn't seem to be anything wrong with my machine. What a let-down! The Audio Test has failed at (I think) the Analog Sound Playback, i.e. I've heard NO sounds and am getting 1B22:061B/0F1B/101B/071B errors.

 

In Windows my sound seems to be ok - I hear CDs, files in different formats, streaming radio and have passed Creative Diagnostics. I've only had the Dimension for some days and may-be there are other audio bits I should test in Windows?

 

I wonder if I've made some mistake in setting up the machine? For the first time I've looked at the diagnostic lights at boot-up and see yellow BC immediately replaced by yellow AD, stopping at yellow D when I end up at Boot Device Menu.

 

Any clue, folks?

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Dimension 5000
XP Pro on 250GB SATA h.d.
nVidia GeForce 6800
SoundMAX Ingegrated Digital Audio
Soundblaster Audigy 2 ZS 7.1