My wife dropped the scales and it did the same thing, kept displaying OVERLOAD even after resetting.
I unscrewed the round platform to have a rummage, couldn't find anything useful, but then I screwed it back on and pulled it gently up to try and 'undistort' the metal block.
The display then read -1200g or something, but after I pressed the reset button it seems to be working OK again.
brw
December 2008