Something annoying this way comes: target-disk MacBook for iMac boot-drive

So, this should be doable, but it's not working. Can anyone explain why, or what I'm doing wrong?
I have an Intel iMac, and an Intel MacBook - both are running Leopard. I temporarily want to use the iMac as the workstation, and the MacBook as the operating system hard disk. So, I put the MacBook in targeted disk mode, and connected it to the iMac via firewire 400. From the iMac, I option-booted to see the available boot disks. I then selected the MacBook's disk and clicked the arrow icon to boot. Once the iMac attempts booting, it displays the spinning cog on gray screen for longer than usual, then goes to a blue screen with an intermittent spinning cog. It seems to hang at this point.
I've done this with PPC machines in the past, so I'm not sure what the deal his here. The only things I can think of that would be a problem, but really shouldn't be are: 1) the MacBook is running 10.5.2 (keeping it at v2 due to the CS3 issue) and the iMac is running 10.5.3. Also, the iMac is the 24" model - so perhaps there's a screen resolution issue...
Any advice out there? THANK YOU!

Hmm, I don't think it's too outlandish of a thing to do. Let's take this example - Apple Mail on my MacBook. I'm going to totally reorganize my email life based upon the MacWorld article linked below. Anyway, this is going to be a huge task for me - I have a bazillion mailboxes and emails, etc. It would be soo much easier to do this with the big screen. My email setup is too complicated to describe here, but the purpose of my post was to figure why I can't do something that should be doable. There could be many reasons to boot the iMac using the MacBook's HD. And, it should work. So, the reason why I'm trying to do this is somewhat irrelevant. It's something that works in one direction, and I'd like to know why it's not working in the other direction. I'd be surprised if the issue is that the MacBook doesn't have the proper driver to work with the iMac's high resolution display - in that case, as with PPC machines, the usable screen would just 'shrink' to fit the maximum resolution of the OS.
Thank you for the shareware recommendation - I'll try it until I figure out why what I'm trying to do doesn't work.
http://tinyurl.com/6ru96u

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    So, this should be doable, but it's not working. Can anyone explain why, or what I'm doing wrong?
    I have an Intel iMac, and an Intel MacBook - both are running Leopard. I temporarily want to use the iMac as the workstation, and the MacBook as the operating system hard disk. So, I put the MacBook in targeted disk mode, and connected it to the iMac via firewire 400. From the iMac, I option-booted to see the available boot disks. I then selected the MacBook's disk and clicked the arrow icon to boot. Once the iMac attempts booting, it displays the spinning cog on gray screen for longer than usual, then goes to a blue screen with an intermittent spinning cog. It seems to hang at this point.
    I've done this with PPC machines in the past, so I'm not sure what the deal his here. The only things I can think of that would be a problem, but really shouldn't be are: 1) the MacBook is running 10.5.2 (keeping it at v2 due to the CS3 issue) and the iMac is running 10.5.3. Also, the iMac is the 24" model - so perhaps there's a screen resolution issue...
    Any advice out there? THANK YOU!

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    If you were to go the other way I can imagine the driver included for the iMac 24' would probably support the smaller Macbook screen.
    I don't have any link or kbase that I can point at to prove this 'theory' because thats all it is - a theory. But it kind of makes sense to me and does explain the behaviour you see.
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