I'm soo stupid. I swapped out the old hdd on my old black 2.0ghz macbook to a new one and tried to install OSX 10.5.x but it did not work. I forgot the black macbook shipped with OS-TIger and I do not have those discs anymore. I only have my Snow Leopard disc and the 10.5.x disc. What can I do? Can I use Time Machine and my external HDD to install the os on the new hdd? Thanks for the help.