Hold 'T' while booting to enter Target mode. If I remember this only  
works with Macs with native FW 400/800 ports.

Sent from my iPhone

On Dec 27, 2009, at 3:00 PM, Christian Wacker <pizzaboy...@gmail.com>  
wrote:

> Boot the Macbook in target disk mode (Firewire disk mode) by pressing
> some key during startup (I don't know everything, but it's available
> on google)
> Insert the installer disk into your iMac, and reboot, installing the
> OS to the firewire one (which is actually the MacBook)
> Problem solved.
>
> On Sun, Dec 27, 2009 at 1:39 PM, Malcolm O'Brien
> <malcolmo2...@hotmail.com> wrote:
>> The machine without the DVD drive (it doesn't read consistently) is
>> actually a MacBook, but the helper machine is the iMac under  
>> my .sig and
>> the principles will be the same regardless of model.
>>
>> The MacBook owner deleted a bunch of stuff based on its dates and  
>> times
>> and thereafter booted to a flashing folder with a "?". When I got it
>> from her and turned it on, the optical drive made a terrible screechy
>> noise. I took a loose scrap of plastic out of its innards and the  
>> next
>> time I booted, no ugly noise. Good!
>>
>> Thinking an OS reinstall was called for, I put in the Install disc  
>> and
>> away we went. During the "checking your disc" phase (around 13%),
>> something happened and a "can't check your disc" error appeared. I
>> clicked "Ignore and continue" and it began to install but failed  
>> along
>> the way. Now when it tries to start, it begins to boot but then  
>> panics
>> and says to restart.
>>
>> So I started my iMac in Firewire mode with the install disc in the
>> SuperDrive, started the MacBook holding down Option, and found that I
>> was offered the option of the fratzed internal HD or the HD on my  
>> iMac.
>> I'd hoped that the iMac's SuperDrive would be included in the choices
>> but no such luck. (I guess it isn't booted enough to know that my  
>> Prefs
>> says to share the drive.) So I boot from my iMac HD. No problem.  
>> Things
>> are fine - wonderful! - EXCEPT no sign of my iMac's optical drive.  
>> GRRR!
>>
>> So I reboot the iMac normally. I make .dmg's of the 2 Install discs,
>> figuring I'll at least be able to access those on my HD. Back to
>> Firewire boot, start the MacBook via my iMac HD, navigate to  
>> the .dmg's,
>> run the Installer, and ... oh, yeah ... it makes me restart the  
>> MacBook.
>> This, of course, is worthless. DOH!
>>
>> So now I'm looking at the instructions at:
>>
>> http://www.maciverse.com/install-os-x-snow-leopard-from-usb-flash-drive.html
>>
>> even though I don't have a suitable USB drive!
>>
>> Can anyone tell me a better option? How do you install the OS  
>> without a
>> DVD drive? Will I have to go into the Apple Store and have them fix  
>> it?
>>
>> I _do_ have a Firewire-equipped enclosure into which I could put a  
>> HD.
>>
>> Thanks for reading and thanks for any assistance offered.
>> --
>> Malcolm
>> 800MHz 17" flat panel iMac running Leopard (1GB RAM, 500GB HD)
>>
>> --
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>
> -- 
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