If the mode on your Casio Edifice ECB-900DB-1AER watch suddenly changed to "CHG" and the hour, minute, and second hands got stuck at 12 and stopped functioning even when pressing any of the buttons, you can try the following steps to fix the issue: 1. Shifting the Hands: To move the hands out of the way for easy viewing of the display information, hold down the (B) button and press the (D) button. This will shift the analog hands. To return the hands to their normal timekeeping positions, hold down the (B) button and press the (D) button again, or press the (D) button to change to another mode. 2. Solar Charging: The watch runs on power supplied from a rechargeable (secondary) battery that is charged by a solar panel. Make sure to expose the watch face (solar panel) to bright light when you are not wearing the watch. Avoid blocking the face of the watch from the light. If the battery goes low or dead, expose the watch face to light as soon as possible. 3. Checking the Charge Level: In the Timekeeping Mode, the current charge level is indicated by the mode hand. A good charge is indicated by the mode hand pointing to A or B. If the charge level is low, some functions may become disabled. If the battery goes dead, the [CHARGE] indicator will appear and the second hand will rotate counterclockwise until it stops at second 57. This indicates that charging has started. 4. Hand Alignment Adjustment: Strong magnetism or impact can cause the time indicated by the analog hands to become different from the time on the digital display. If this happens, you can adjust the hand alignment. Enter the Timekeeping Mode and hold down the (A) button for about five seconds. Release the button when [00] starts to flash. Use the (B) and (E) buttons to align the second hand, mode hand, hour hand, and minute hand with 12 o'clock. Press the (A) button to exit the setting screen.