I just replaced my hard drive in my 2007 MacBook Pro. However, when I now put a disc in the superdrive, it only reads it occasionally. Most of the time, it just spits the disc out. I've tried my tiger install disc, leopard install disc, and snow leopard install disc. NOTE: I cloned my old hard drive to a back up and put it back on the new hard drive once installed. So, I'm up and running, but I want to reinstall leopard as a fresh install, but the superdrive doesn't want to work.