Help Please! I have a macbook, and it came with Leopard on it. I just bought a new internal hard drive for my macbook, and I installed the new hard drive. Now when I try to install leopard (retail version), I get an error message that it cannot be installed. I partitioned the drive to be mac osx extended journaled, and I clicked the option for GUID. The reason I am using the retail version of Leopard instead of the discs that came with the computer is becuase I lost them at apple and no longer have disc 1, so I purchased the retail version. What can I do? I found another thread about this but the problem was the the user was using a disc that came with someone elses computer I believe?