Or, Conflict Catcher.
Ha, those where NOT the times.
Still remember this app, solved a few issues for me.
But, I learned you could do this by yourself if you could start up from another disk, you could disable/enable extensions yourself to find the problem.
But, it would take a lot less time if you used Conflict Catcher.
Geez I remember those days. Disable half of the extensions, if the problem persisted disable half of those, etc. until the problem extension was identified...