Tom:

This is the target disk mode. Start with the Mac you wish to boot off 
(or your machine off if using a peripheral FW disk.) Hold down the T 
key until the FW icon appears. Of course, the FW drive (which can e an 
iPod) must have a system folder and OS on it to work. Apple says it 
works best if the FW drive is connected and mounted prior to beginning 
the boot sequence.

I've only used this once or twice and it's been a while, but it works 
if you have a HD that's trashed or a corrupt system folder that needs 
examination.

You must have a logic board that supports this. My old Blue and White 
does not, but I believe all G4 PM logic boards and all boards after 
1999 do. Hope this helps.

ctw

On Feb 11, 2005, at 4:48 PM, Tom Guenthner wrote:

>
>  What is the key sequence to hold to force boot from a external 
> firewire drive? 
>  
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