I don't know why but it keeps ejecting it on boot. It installed fine on my Macbook Pro but Mac Pro keeps ejecting it... =( Is there a step I'm missing out on? This isn't bootcamped. I've had Vista 64 on the harddrive by itself before and now I'm trying put 7 on it. I insert the disc, reboot the computer, and it just keeps rejecting it. I really want to do a fresh install on this computer. What do I do?