Okay, well, I have a rather strange problem Today my mac stopped working - appeared frozen at the login screen. Would not accept keyboard input. Could ping it on the network, but not access it remotely (ARD or SSH etc) So had to hard reboot. This Mac has 3 HDDs in RAID5 with an Apple RAID card. The raid card presents a single volume to the system. Anyway, I now get flashing folder with question mark on startup. Booted from Mac OS X 10.5 Server DVD. Disk utility cannot see any volumes at all apart from the DVD drive. But, RAID utility reports a healthy all-green RAID card and raid set. What should I try next?