Global Nav Open Menu Global Nav Close Menu; Apple; Shopping Bag +. Mac OS X & macOS names. As you can see from the list above, with the exception of the first OS X beta, all versions of the Mac operating system from 2001 to 2012 were all named after big cats. Quick video showing how to boot from USB flash drive on Power MAC G5. Command on Microsoft keyboard is: Windows key + alt + o + f In Open Firmware: boot ud:3. Explore the world of Mac. Check out MacBook Pro, iMac Pro, MacBook Air, iMac, and more. Visit the Apple site to learn, buy, and get support. I have received an old Mac Pro G5 running Mac OS X Leopard, and have tried updating it to its newest possible form. When I downloaded Mac OS X High Sierra and even Snow Leopard, it says “Can not update” when I try to open the update file (Through USB). By the way, I was connected to the internet by ethernet.