It is already 1 year I am wearing a Casio watch.
Just wanted to add some potentially useful information here. My DW-2000 had a dead module but a good case. I sold it... for quite a bit less than I would have gotten had it been running. A fellow in Europe bought it (I think he was from either the UK or Germany). He was able to fix it! Turns out that the battery had leaked a little and cause a short inside the module. He took it apart, cleaned it out, and it became functional. Mind you, I did partially disassemble the module to try finding what could be the problem and never saw any trace of battery leakage. It may have been slight, in just the right way to avoid obvious detection.
So... that's a promising case for dead modules, whereby they may be fixable.