|… boot cd:,\\:tbxi will not let me boot from the external.|
cd is an alias for the internal optical drive, so the boot command as given will not access other drives.
Try the following to set up the correct boot path:
- Use the System Preferences to select your Mac OS X Install DVD as start device and restart or
Launch the Install Mac OS X application on this DVD and tell it to restart.
(Both methods will set the required boot path.)
- Press and hold Command-Option-O-F until you enter the monitor — don't let your Mac start from the DVD.
- Enter the commands as given in the first article to temporarily change the systems notion of the cpu frequency, but without the last line containing the boot command.
- Now boot using mac-boot, which will continue the interrupted restart and boot from your DVD.