I have just got my 8-core Mac Pro and would like to install Tiger on a second internal drive. I need this to run a couple of apps that won't work on Leopard. Apparently Intel Mac Tiger discs weren't around for that long so they are hard to pick up. I have, however, got the Tiger install discs for my MacBook Pro. But they don't work - if I boot off them I get a grey screen. I guess this is because they are machine specific. Does anyone know a workaround? Thank you.