WDGWD1003FZEX-won't boot Macintosh G5

OS 10.5.8. Partitioned drive as Apple Partition Map.
Cloned data from boot drive to new WDGWD1003FZEX.
Machine won’t boot from new drive. It mounts when not the boot drive in the second drive bay, but will not boot the machine.
Is there a way to force it to act in SATA I via jumpers or some other method?


Have you tried pressing the “Option” key while booting the Mac to see if it shows the hard drive?

Yes, I invoked the startup manager and it wasn’t seen.
I believe at this point it needs a jumper to force it from SATA II or SATA III to SATA I.