...but I'm just learning. Bought a used G4 with Jaguar on it. Over the years, upgraded to Panther via a multiple upgrade that my boss had purchased. He gave me one, he's a good guy! So far, legal as far as I know. One day (recently) my hard drive crashes. I install a new drive and install OS X with install disc from when I bought the computer off suck-bay. I now have a G4 running 10.1.5. Do I really have to buy Jaguar AND Panther to get back to where I was?!! What are the odds I can grab the OS from the bad disc? I already spent $100 on Disk Warrior. I didn't anticipate this situation.