My machine: Digital Audio G4 1.5Ghz/1.5 Ram/Radeon 8500 Installed SATA controller and attached 500G Maxtor SATA drive and 320G SATA Seagate. Partitioned both to 80G for 10.3.9, 20G for OS9, rest for storage. Used SuperDuper (erase/backup all files) to clone other working 10.3.9 to both new drives. Seagate boots/reboots fine but once booted to Maxtor, drive runs normally but will no longer restart to itself. The only way to get to the Maxtor as boot drive is to boot to either the ATA bus or SCSI drive (running from UWMiles card) and then to the Maxtor. If I shutdown I can boot to the Maxtor, just a warm restart to itself or from the other SATA drive is not possible. Drive always mounts so that is not a problem. Have wiped drive several times, tried different partition schemes, cloned different systems, reinstalled X from scratch but result is the same. After initial boot to Maxtor, works as expected, but restart to itself is not successful, even from Terminal after reblessing (it shows as blessed in Terminal) and setBoot commands. Dumping caches or replacing BootX doesn't help either. SMART status is OK and running Disk Utility and TechTool Pro did not reveal any problems. Also tried switching cabling of SATA drives but no difference. Using Option key on startup gets me partially through the choices of boot drives but then screen freezes so I can't use that method. Any ideas? TIA.