I have a Casio Module 2406. I understand it is similar to the G-Shock. I replaced the battery and now the display flashes on and off at a 1 second rate. When on, it shows 12:00 and all the usual symbols you see in the timekeeping mode. I tried the reset (shorting between the battery + and the contact in the hole marked AC) many times without any change. When I replaced the battery, I did not attempt (for very long anyway) to release the battery from the top. Instead, I released the catches and released the battery clip from the bottom. So I guess I could have done damage by that procedure. Any thoughts on this matter would be greatly appreciated. Thanks