Have you attempted to reinstall 10.5.2 or are you attempting to restart and update? To clarify, if you are attempting to update from 10.5.2, but are experiencing problems with 10.5.2, that may be the issue. Or if you attempted to update and the system crashed during the update, that may be the problem.
no, we have not attempted to re-install 10.5.2. Should we try that?
10.5.2 was the original os x software on the computer when we purchased it.
Yes, you should "Archive and Install" the Mac OS X first, especially since the combo update locked up. I am going to get a full instruction list together and post in a few minutes. I am going to convert this to a Q&A first.