Intel macs hand during boot, anyone else?

Am I the only one with this problem? I have 16 eMacs running 10.4.7, 45 old iMacs running 10.3.9, and 12 Intel iMacs running 10.4.7. All work great [b]except[/b] the Intel iMacs. All computers were first bound to a windows 2003 AD server for user authenication. AD also tells the Macs where to find the user's home directories. These are found on an old Mac G4 server running 10.4.7. At this point a student could login to any machine and all would work. All machines could also reboot properly. Then I built a new Mac server running 10.4.7 and made it an OD master. It is not bound to the AD. I then bound all the lab computers to the OD. They were put into groups and I started to manage settings. All computers continued work well, untill I had to reboot some. Now, the problem: the Intel Macs will hang during boot. Sometimes I will have to force shut them off, and turn them on four or five times before they continue to the login screen. If they do make it, all works as expected. Where do I start when trying to fix this? What logs do I check? Why is it only the Intel iMacs?