Hi, I'm trying to reinstall OS X Tiger on a 15" Powerbook but am running in to problems. I know the disks are fine as I used them to rebuild an iBook earlier tonight. Upon booting from CD 1, it makes a few reads and then I get to a blue screen. It stays there for a minute, but then the DVD drive spins down and nothing happens. Has anyone seen this before or have any ideas what I can try to fix it please? Google hasn't been much help. Thanks, Mike.