I'm not sure if this is a MacPro or System 10.5.2 issue or something else, but... Got my new MacPro on Thursday. When I got it, I plugged in all my drives to figure out what gets daisy chained where until I get my PCI Sonnet Firewire card. All my drives worked great, no problems (1 Lacie, 1 G-Tech, 2 WD). I ejected the two WDs from the Finder window and unplugged them. Then proceeded to install and update all software (FCS, OSX 10.5.2, Photoshop CS2, etc). Aside from 10.5.2 everything I installed was in my old iMac. Since then, I haven't been able to get either of my WD drives to work. One won't even power up. The one that does power up won't mount and looking at it using Disc Utility shows the drive as existing, but all options to repair/access it are greyed out. I checked the WD website and there were a few MyBook updates for firmware, button manager, drive manager, none of which seem to have any effect. Is anybody else having this problem?