I got myself a used Power Mac G5 without hard drive. The Person i bought it from had an 80 GB Seagate hard drive. i am replacing it with an 80 GB Western Digital. However i cannot get the machine to boot from the CD it just gives me a gray apple and an unending turning circle. i tried a different drive same make and model as the one i am trying to get the machine to take and the machine did boot from cd that time but didn't recognize the drive i assumed that was because it was an old windows drive. I have combed every forum i could find online with relevant topics nothing has worked so far anyone have any ideas?