Broken iMac display - nothing visible - How to set up external display?

I have a 17" Core Duo 1.83 with a cracked screen. It boots but I can't see anything thru the cracks. I can access the system in Firewire Target Disk mode, which I used to wipe the HD and reinstall Leopard.
Is there any way to boot the iMac in Display Mirroring mode, so that I can set it up to use an external display? I have a 22" Dell connected via DVI and would like to use that.
I guess the ideal would be a keyboard shortcut to use at startup. I've seen on other boards that there is such a shortcut for the Macbook: Command + F4. But it doesn't work with the iMac.
I also have the Remote Control if that could be any help.
Would voice commands be an option? If so, how would I activate and use them, given that I can't see anything on the screen? I don't remember ever activating them, so I don't know if they'd be on at the moment.
My idea is to turn the iMac around with the broken screen facing the wall, then use it with the Dell monitor. Still lots of life left in the iMac with 2GB RAM, works very well with Leopard, still quite fast.
Any help would be GREATLY appreciated. Thanks.

Okay, looking good for now!
I found a thread on Mac Forums. Link: http://www.mac-forums.com/forums/apple-desktops/184101-help-broken-imac-external -screen.html
Guy explains how he solved problem of iMac with broken screen, connected to external monitor; you need a second Mac to do this.
I quote:
-- What u need to do is drag the menu bar from the iMac with broken screen in Sys Prefs/Displays to the Ext Display - which of course is not possible. So if you were to connect the damaged iMac by firewire to another Mac with an External display - start the damaged iMac in Target mode by holding T key after powering on. Then start the Mac with Ext Display and hold Option Key and select the damaged Mac to boot off - once that is going go into Sys Prefs/Displays and drag the menu Bar onto the External Display to make it the Primary one. Then shut it all down and connect the Ext Display to the damaged iMac and with luck you will be GO. --
I cloned my Macbook 10.5.8 system to the iMac HD and made it bootable. Seemed to be working fine. I then shut down both Macs. I connected an external display to Macbook. The Macbook and iMac were still connected via Firewire. I booted the iMac and pressed T, so it booted in TDM. After about 30 seconds I booted the Macbook and pressed Alt: the Macbook's and iMac's disks were available as boot disks. I chose the iMac's disk and waited.... Seemed a long time. But finally the external monitor came to life and I had the whole thing working, more or less.
The setup was in Extended Desktop mode, with the extended desktop on my external monitor. Luckily, a bit of the top of the iMac's screen was semi-visible, and I was able to open Display Prefs. I selected Mirrored Displays at first and then was able to work on the external display (and not thru the cracks). From here, I unchecked Mirroring and selected the external display as the main one. This worked just fine. I have a 23" full HD monitor and it looked great.
I then shut down both computers, disconnected Firewire, disconnected the monitor from the Macbook and connected it to the iMac. Then I rebooted the iMac. It booted up a lot quicker, but on startup it went back to Extended Desktop, with the iMac's display as the Main one. Again, I was able to open Monitor prefs, then clicked on Gather Windows, which put the pref window on the external monitor desktop too. Again, from there, I could make the external monitor the Main one.
Question: is there any way to make the iMac boot to where the external monitor is the Main desktop all the time and by default?
If not, maybe the worst case scenario is that I have to set display prefs to Mirrored before shutting down. Then after startup I could just make the external one the main display again.
Many thanks David.
P.S. forgot to say that when I set the external monitor as the Main one in display prefs, it all worked okay, except that when I opened System Preferences, the window opened on the iMac's screen, not the external one.
Is there a setting to make all windows, in all apps, open on the Main display?
Message was edited by: moonshot61

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