Sounds like the optical lens is out of alignment - the clicking sound is coming from a worn, dirty or damage drive sprocket, which is forcing the lens out of focus. If you can, remove the lens housing and check for any grit or damaged inside the drive assembly. If no damage has been found, clean and re-grease using petroleum gel ie, Vaseline. Re-align the lens using an aptical out to your TV before complete re-assemble. Good Luck.
Merlin, August 2006