What I started with: I have a dual 2.00 GHz G5 with only hardware modification post factory was addition of 200 GB Maxtor SATA drive. System ran fine past 90 days. NO Apple Care (thanks budget) NO System CDs (found out after 90 days) I do have a G4 system, and OS X.3.2 purchase direct from Apple. Problem and steps taken to attempt to resolve Primary drive failed. Moved add on drive (Maxtor 200 GB) to primary drive ATTEMPT to reinstall OS X.3 G5 Machine does not boot from OS X CD (media is ok, used it to boot from and install OS X.3 on Powerbook G4 Titanium) Check power cables, data cables, drive jumpers, flash PRAM/ reset Firmware via console, etc. The basic troubleshooting steps. Hold down Option on boot and select OS X install media as boot device, machine fails to boot. Hold down T and boot to target mode. Install OS X.3 (Panther Retail CDs) via firewire from G4 powerbook to Maxtor 200 GB drive (successfully) G5 boots to Apple logo and then circle with a slash. Comment / Thought If the processor(s), memory, and/or logic board are bad, then firewire mode would not work, nor would the CD media be recognized by booting with option key down. This BEHAVES similar to the following situation in the DOS world: If a single drive with a single partition is set up with FDISK, but the partition is not set ACTIVE, you can boot from a floppy and read and write to the C: partition. However, you can not BOOT from the C: partition. Is there an OS X.3 equivalent to making a partition bootable?