So, I am upgrading my friend's MacBook Pro (old, Core 2 Duo, 2.33 ghz) to SL. She was on Tiger (10.4.x). Initially, the cd drive wouldn't take the SL installation disc, but it would take other DVD's. I then cleaned the SL disc and it accepted it. However, whenever I would hit "restart" to continue installing SL, the computer would reboot and spit the SL disc back out. I did some googling and concluded that the CD drive is failing. Not worth it to pay for a new one as the computer is 5 years old. So then I figured out I could use another MacBook Pro in target FireWire mode since I know that disc drive is working. I began the installation, the computer rebooted to start installing SL, and now it seems to be stuck (has been showing the spinning loading icon for over 1.5 hours now). Both machines are still connected via FireWire, and I'm going to leave them that way overnight, but what should I do? How can I safely unconnect them? Any help is appreciated. Thanks.