Rescue attempt of iMac via MBP.  DVD issues

I am trying to rescue my dead iMac using an install DVD and my MacBookPro. Long story short; the iMac died a while back and will only boot in Target Disk mode. I have backed up the iMac to an HDD, so I have the data saved. I am trying to mount the iMac via Target Disk mode on the MacBook Pro, insert the install DVD, and then do an erase/install on the iMac hard disk. It does not work.
I have tried doing this with the DVD in both the iMac and the MBP, but each time I allow the installer to restart the MBP all I end up with is a pale blue screen on the MBP, and the Target Disk logo on the iMac. I sat and watched this for about 10 minutes, but there was no change. It does this regardless of which computer the DVD is in.
What am I missing? How can I use my MBP to rescue my iMac?
You can find background details (if you need them) in my previous posts on the initial recovery attempts on the iMac.
http://discussions.apple.com/thread.jspa?threadID=2525930&tstart=0

Hi Sasane
Using a wired keyboard, pop the original install DVD for that iMac into the DVD drive and start it up holding the Option key and see if it will boot into the Startup Manager. In the Startup Manager normally you will see both the Internal HD and the DVD with an arrow below them, in your case in the Internal has failed you may only see the DVD. In any case if you select the DVD the iMac should startup from the DVD. Once you are booted from the DVD, skip the Installer and go up on the menu bar and select Utilities > Disk Utility. If at this point you can select the Macintosh HD, select Repair Disk. If you can not see or select the Internal HD or the Macintosh HD, then the Internal HD has failed and needs to be replaced.
If I have lost you or you still can not see the Internal HD, then do a JGG suggested in your other thread and run the Apple Hardware Test. Again using a wired keyboard and the proper install DVD +(as per the following article)+ and run the Apple Hardware Test. > http://support.apple.com/kb/HT1509
If the Repair attempts fail, the HD appear's to be missing and/or the Hardware Test will not run, then the iMac needs to go in for service.
Dennis

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