I have the same problem. I tried the reset button at the bottom, but it dosent have any effect. I bought my scales over 12 months ago so the guarantee has run out, but I have NEVER used them. I got them out today to start using them , and all I am getting is the OVERLOAD display.
Helppppppp !!!!

E, November 2008

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