So got my hands on a 8 core mac pro with 1tb drive, I have a spare velociraptor and want to use it as boot, but everytime I try to boot off the osx disc it gets stuck at the apple logo. If I put the 1tb drive back in and hold down control on boot then it will go back to the pre loaded os, i installed the os on the vraptor and once it restarts its stuck at the logo.

Anyone got any ideas? I'm new to mac but, got this for free so figured why not mess with it.