Hi I have recently been trying to install tiger onto an external firewire drive. I formatted the drive, began the install process and everything went fine till the process finished with the 1st dvd. The computer restarts, shows a grey screen for a minute or so then starts up normally with the internal drive. Anyone got any ideas? I have a 2GHz G5 iMac with 1/2 GB ram and Tiger with everything up to date.