He there, I bought a white 600Mhz iMac (Which was originally purchased from John Lewis for £899) And it had 10.3 which was nice but I thought that I would try the original iMac G3 cd's that came with it which where os 10.1 as I thought it would be faster... Anyway, it was slower - so slow it was impossible. I have a copy of the Universal panther CD and it comes up on the computer and I click restart to install (Something like that) and then it restarts, spits the CD out and then boots into OS 10.1. I have even tried Tiger. It worked on my other iMac (the blue one) but not this one... Please could you tell me whats wrong! Thanks, John.