Cant find dock preference file

Why can't you do that with DockColor? Perhaps it removes com.apple.dock.plist in favor of its own implementation. May need to fully uninstall if it remains active in some way to perform its business.

Open DockColor, then under the "File" menu click on "Revert to Default". Type your password when prompted and quit the application.

Ok,
Try this, download the original dock files from
http://leoparddocks.com/GetYour_Original_DockBack.php

Go to Macintosh HD > /System/Library/Core Services/
Right-Click on "Dock" and select "Show Package Contents"
Go to /Contents/Resources/
Move the files you downloaded to that folder
Open Terminal and type "killall Dock" (without the quotes)
The dock should restart and have the original look.

Then first remove the ones that are there (put in Trash) then drop in the new ones. Restart the Dock by opening the Terminal application in the Utilities folder and enter at the prompt:

killall Dock

Press RETURN

I download ColorDock and tried it, it modifies the scurve- .png files in the dock application.
So by replacing those files with the ones from the download link, it should without fail revert the dock back to it original state, provided the files are really copying over and replacing the old ones.
Have you tried restarting the computer? The killall dock should work, but maybe you have a special case.

If you don't mind try down loading CandyBar, it should have a trial period.
http://www.panic.com/candybar/

Under the change area click on the dock icon. Then over on the right click on restore dock, enter your password and click restart dock.

Try this,
Download this dock, http://browse.deviantart.com/?qh=&section=&global=1&q=Slate+Dock#/d1tx82s
Double click the iContainer, CandyBar will open, select the dock and click the Use This Dock button (lower right corner). Apply the dock, and see if it changed the dock. If it did try restoring the dock with CandyBar.

Also try repairing the disk permissions.

Message was edited by: McYukon