I have a powermac G5, dual 2.0 GHz, 5 Gb ram, late 2003 model running 10.5.8 (client) as a headless file server in my closet. It's loaded with 2 x 1 Tb hard drives for storage, 1 x 640 Gb as a boot drive, and 1x 500 Gb as a backup to the boot drive (boot drive cloned every night with carbon copy cloner). The boot drive and the main data drive are both on the internal SATA bus in the original drive bays, and the 500 Gb and 1T backup drives are attached to a Seritek 1s2 SATA card. In system preferences, I set my boot drive to be the 640 Gb drive. When I power the system off and power on again, the machine will restart into the 500 Gb backup drive - NOT the 640 Gb boot drive I specify. The only way I can convince the machine to boot into the 640 Gb boot drive is to go to system preferences, select the startup drive (which is already selected to the correct drive by the way), and then hit the restart button on the preferences tab. I have already reset the SMC and PMU for this machine, and have rotated the hard drives among different drive bays and SATA connections. This strange behavior is driving me crazy. Has anyone seen this specific behavior before? Does anyone have any suggestions?