Reply from PowermaxMay 12, 2014
Thank you for posting your review, as well as your question, which is a good one. When the power supply failed in the G5, Target Disk Mode ceases to be an option for the purpose of migration. The good news is that should both of these units be G5 PowerMac towers, a simple solution exists. Each G5 tower has space internally for two 3.5" SATA drives. You should be able to remove the drive from the machine with the failed power supply. It requires no tools to do this. Just open the side panel, flip up the grey plastic drive retainer lever, and gently pull the power and signal cables off the backplane of the drive. The drive should be able to slide right out into your hands. Reverse this process with the functioning G5 tower, but into the second drive bay (below the primary). Once you power the functioning one up, you should see two drives on the desktop. Immediately, go into /Applications/Utilities, and launch Migration Assistant. The migration option you'll need to complete this process, is "From another Disk/Time Machine." That should all applications, and user folders onto the boot drive. Should you run into any difficulties, don't hesitate to get in touch.