Background Imac G5 Have an 80 Gig Seagate drive that I am upgrading to a brand new 500G WD Caviar Black. Partion: Apple Partion Map What I have tried: Clonging the disk: Tried cloning with SuperDuper - old hd was cloned with no issues using USB to new drive Tried cloning with Carbon Copy - old hd was cloned with no issues using USB to new drive Tried recloning after initial clone did work when drive was installed in the machine Used Disk Utility to only have start up files and boot done through USB with old drive in place. In all cases above the blinking question mark folder appears after taking the old drive out, and installing the new drive in its place. I have reset the PRAM - nothing Tried booting by holding down the option to select drive- with new HD in, doesn't show up Tried booting from USB holding down option - doesn't show up Tried Booting from Install disk - drive doesn't show up as a start up drive, only CD shows up Deleted the bootcache file on new drive - nothing What's crazy about all of this is that with the old drive in the machine, the new drive is mounting without issue through USB. I can navigate folders, Utility indicates new drive is Ok. Old drive works fine, verifys Ok. Any ideas would be helpful.