Migration Assistant adn iMac wont recognize Target Disk Mode of iBook

Friend purchased a new iMac 20in and went to use Migration Assistnat to transfer from older iBook. Will call this iBook1
Following directions, he hooked up Firewire cable, rebooted iBook1 into Targe Disk Mode (TDM). New iMac would NOT recognize existance of TDM iBook1. So we began the following sequence of tests to isolate the problem.
1) Using a second iBook2, hooked up original iBook1 in TDM to iBook2. The HD of iBook1 showed up on the desktop of iBook2 as it should, along with all the files inside of it. This verified that the cable was good and that the firewire port on the iBook1 was working as well as TDM on iBook1.
2) We rebooted the iMac, restarted the Migration assitant and placed the iBook2 into TDM and connected them. Migration assistant worked, recognizing the iBook2 as it should. This verified that the iMAc firewire port and Migration assistant was again working fine. We also rebooted the iMac and hooked up the iBook2 in TDM w/o Migration assistant, and again it worked fine.
3) We then tried to connect the iBook1 via TDM to the iMac w/o migration assistant. Again NO RESULT.
No matter what we did, we could NOT get the new iMac to recognize the older iBook1 via firewire TDM. All other connections betwen the computers worked fine. All systems were running 10.4.10. We reset the PRAM, we fixed permisions, still the new iMac would not recognize the iBook1 in TDM.
Any ideas?

I'm having the same problem connecting my iBook G3 500 in Target Disk Mode to my new iMac, the icon does not show up on the iMac. I have tested the Firewire on both computers with a FW XHD and they work fine. I took the iBook in to work and connected it to an eMac and a ProBook Intel with no problems. Back home tonight and it still fails to show the icon of the iBook in TDM on the desktop of the new iMac. Suggestions on a fix ? Thank you.

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