The Hack Conflict Detection Utility is what you're looking for. It's a good place to start to help you find what's broken in your game, just keep in mind it's not a guaranteed fix. What it does is finds the packages in your game that modify the same global procedures and have the potential to conflict. It won't tell you what is definitely conflicting.
It can miss the real problem and not list the actual conflicting files, so the best way to track it down for sure is to take out all your mods and find out the old fashioned way.
You can find it
here. (Look under Sims 2 > Programs)
