Well, here's the thing. I have a minimac and a 17 inch macbookpro. Earlier this week, I bought a original Leopard and decided to update both my machines. Up until now I've had 2 basic problems. 1 - When I inserted the disc in my minimac, it wouldn't mount. I waited and waited and nothing happened. I then restarted it and nothing would show up. So I did a few maneuvers such as "restart and clicking the mouse" and nothing. I followed some other instructions and nothing. I then entered the System Profiler and checked the ATA (where my cd/dvd drive should be), to get a message " there are no devices... bla bla bla". Luckly I left the computer pissed and when I got home later, my brother had gotten it out after he turned it on some point of the day. So then, I gave up on the minimac and went on to my macbook. 2 - I inserted the disc, it mounted and everything started to work nicely. That is until after the "consistency check" of the disc, the installation failed. It encountered some "unknown error" and advised me to restart the computer and try again. As soon as I got up to the "choose your disk", my HD had a exclamation mark (yellow). It said there was some problem with the HD and if I wanted to insist on installing it there the disk would be formatted first, either that or give up and restart using the startup disc. Obviously, I gave up. But as soon as I restarted the computer it would load the gray screen with the apple, "think" for a while and shut down. I haven't gotten any progress. Please help me. Thanks.