I originally bought a Rev A MacBook Air, but when I had overheating problems Apple replaced it with a Rev B, but they did not give me new install disks. This morning I attempted to reinstall Leopard on the Rev B from the Rev A install disks and it would not work. When I double clicked "Install Leopard" it told me to restart. It attempted to restart; the gray screen popped up, but instead of giving me install options the display would alternate back and forth between being off and the gray screen every few seconds. The fans were running crazy and this lasted roughly 50 minutes before I turned it off. I tried installing several other apps, including optional installs from the same disk, and everything else worked fine on my superdrive so I don't think there's a hardware issue, or even a "defect" in the disk. My theory is that I need a Rev B install disk and the Rev A will not work. Can anyone corroborate this theory?