Hi, I'm trying to install Leopard on my iMac g5. It currently has Tiger on it. I insert the DVD, it comes up with the normal Click here to install, but when I restart it freezes. I held down C during start up this time to make sure that it booted from the DVD. After the apple logo screen, it went to a blue screen with a cursor that I can move around, but that's it. It's stuck there. Any help? Thanks!!