User accounts dissapear from login window after upgrade

I upgraded a MBP from Tiger 10.4.11 to Leopard--standard upgrade (not archive & install). It looked like everything went well, but upon reboot, there are no accounts listed, only 'Other'. Both Admin accounts on the machine seem to have vanished as far as the login window is concerned. All accounts are still on the machine in terms of data/user folders; with files intact (viewed them via target disk mode). Machine has around 90GB of data so would like to avoid having to do an archive & install on top of this--hoping there is a quick fix for this. Any ideas?
Message was edited by: rhkarma

can you log in as root using "other"? use [this link|http://support.apple.com/kb/TS1278] to reset the root password if you haven't set up one.

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Charles at Apple Service & Support thought that you might find this article useful. We hope that it helps resolve your technical issue.
Link: http://www.info.apple.com/kbnum/n306965
Mac OS X 10.5, iMac (Late 2007): Stuck in a "loop" at the login window after upgrading to Leopard
Issue or symptom
After installing Mac OS X 10.5 Leopard on a 20-inch or 24-inch iMac (Late 2007) computer, you may not be able to log in at the login window. Your login name and password are apparently accepted, but after a blue screen appears for a few seconds, the login window reappears instead of your desktop.
Products affected
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Mac OS X 10.5 Leopard
Solution
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Start up from the Leopard Install DVD and perform an Archive and Install installation (and select Preserve Users and Network Settings).
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If Leopard is not yet installed
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