I am new to this site. I have a macbook pro. I had leopard loaded at the mac store several months ago and love it. I have bought a use mac laptop G4 with OS X on it. I ordered a new leopard disk for the used laptop. When I insert the disk into the drive it starts to read it then kicks it back out. I have check to make sure that the laptop has the right memory and processor and it does. Can anybody help me with this problem. Thanks