Getting strange messages and Logic won't open PLEASE HELP!

Question

I haven't opened Logic for a few weeks because I have been out of town.
I just tried to open a project and got the message "logic pro has detected a possible conflict between one or more third party midi or audio drivers" and an empty project pops up with lines through all the plug-ins, etc...
When I try to simply just open Logic (NOT a project) Logic simply does not open and just sits there. (The little Logic opening window stalls on the "Searching for Audio Unit Plug-ins (Apple:AUbandpass)...)
What could be causing this?
The only thing I have done recently on my computer that is a little out of the ordinary is drag the "Preferences" folder (User/Library/Preferences) to my desktop to try and fix another issue I was having on my computer, BUT I QUICKLY UNDID this action (with the undo function) before continuing. Could this have anything to do with my current problem? I have project I NEED to open now and I can't figure this out. PLEASE HELP!
Message was edited by: Jack Q

Answer 1

UPDATE:
I was able to get Logic to finally open (sort of), BUT:
When I go to the Audio Units Manager it shows ALL the audio units as crashed, or "crashed validation" under the compatibility heading.
All the boxes are unchecked on the left. When I try to check any of them, it says in the grey window that pops up, for example:
"validating Audio Unit AUAudioFilePlayer by Apple:
validation result: crashed validation
updating properties of AU AUAudioFilePlayer by Apple...done."
THEN a window pops up stating: "The application Logic Pro has quit Unexpectedly" and this happens every time I try this.
Also, every time I start Logic I get the same "The application Logic Pro has quit Unexpectedly" pop-up window, along with a Logic pop-up dialogue that reads: "You are using incompatible Audio Units. Dear Logic Pro user,
you have 1 Audio Unit(s) enabled which did not pass the Apple AU validation. This may cause problems and can even crash Logic Pro or lead to data loss! Please check with the manufacturer(s) for updated versions. We recommend disabling these plug-ins in the AU Manager." with the buttons: Start AUmanager or Ignore.
AND, even more odd, regardless of what button I choose Logic continues to open to the arrange window.
Is there anything I can try next? I am going insane over this...