I am currently using Windows Server 2008 RC1 on my workstation (not by choice). Installation went very smoothly, but I can't get sound working. I started Windows Audio Service and installed only available Vista x64 drivers from Intel's site.
The problem is particularly strange because there aren't any warnings in device manager. My speakers/headphones are recognized when I plug them in. Also, there is no audio level detection in the audio mixer's audio level bar; no matter what I play, I can't see the green bar going up. I don't have any knowledge about Windows audio layers, so I can't see where the problem occurred.
The motherboard is D975XBX2 (i975X chipset).
I just noticed that audio is detected in the Control Panel > Sound panel. The bar goes green for the my default device (headphones) just as it should, but still shows nothing for the mixer.