Then, before the screen lights up, hold down Command-Option-O-F until the Open Firmware screen appears. Shut down the Mac, then power it up, and before the screen lights up, quickly hold down the Command, Option, P, and R keys, until the Mac has chimed twice more after the powerup chime. Sometimes if volumes don't appear in Startup Manager (what you get when you hold down the Option key at startup), you need to reset the Mac's PRAM, NVRAM, and Open Firmware. My system is running 10.4.8, so I'm not sure if this is a 10.4.8 feature, a SuperDuper! Related thing, or if it has to do with some other factor, but it works, and that's all I care about. But for recovery purposes, this could be invaluable. OS X booted successfully off of the external drive, albeit slowly. It showed my internal drive as well as my external backup drive as valid boot drives, so I chose the external drive. Today, just for fun, I rebooted my PowerBook G4 with the USB drive connected while holding the option key to load the boot drive selection menu. I backed up my internal drive to an external USB 2.0 drive using (a great application, by the way). Talks about getting a PowerPC Mac to start from a USB 2.0 drive, but it involves messing around with the system's NVRAM, which can be a complicated thing to do. This isn't so much a hint as much as a discovery, but it could be useful to someone.
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