Hi all, I tried XP SP2, Vista beta 2 (which I hated), Vista RC1 (much better, but still Windows) and then Vista RC2. (Still on RC2 now). I of course, have the "no sound" problem. Sound worked fine in XP with the Apple provided sound drivers. Vista claims I have no audio device although it shows the Sigmatel High Def. item in Device Manager (looks more like a codec than a device). I tried to remove it and add it back, including "Add Hardware" in Control Panel and pointing it at the driver files. I ran the "Macintosh Drivers for Windows XP" with /V /a and extracted them. I ran the setup but still no sound after a reboot. I have tried pointing it at C:\Windows\system32, C:\Program Files\Macintosh Drivers for Windows XP\Sigmatel\WDM, etc. etc. etc. - no avail. Performance on RC1 and RC2 is actually quite good though it boots slower than XP or Mac OS X did/do. (XP is no longer installed right now). I have Aero and a rating of 3.0 on the Windows Experience Index. (1 GB RAM) I've scoured Google and found all kinds of "solutions" which don't "solute" the problem. (In other words, don't fix it). Can anyone help me out? I even tried running the setup for the audio driver in "Windows XP SP2" compatibility mode. If this worked I'd be all set! Thanks.