Okay, here's one for you (can't install).

[rgG]

wurm wrote:
Ooh..that's a good question. These discs might have been from my son's Core 2 Duo. Crap. Although, shouldn’t it still be able to install Leopard? As I said, it's running Snow Leopard now.

But not from machine specific install discs from another machine. Sometimes yes, many times, no.