GWM850 7 all blank - not working

Unplug it for a couple minutes and then plug it back in to see if it will start up again, if not look in your instruction manual. If nothing about it, contact the company of your machine

If you have Alarms on, you will see a small bar above the Alarm numbers (1 to 5).
Press the Mode button to get to Alarm mode. You will see Bell AL on the top. Use Reverse/Forward to switch to the Alarm you want to turn off. The Alarm number will increase/decrease on the right of the time.
Use the 12/24Hr button to cycle through the Alarm options.
When the Alarm bar is blank, the alarm s/b off.
Note: The Casio manuals are online.
http://www.manualslib.com/manual/221397/Casio-Db36-1av.html

These small clips are just hooked around small prongs. You need a VERY small screwdriver (now that i think about it, a needle may work). Just pry the looped ends up and lift gently. I have done this a couple of times, however when I replace my batteries nothing happens. Last time I had to send it back - some info stated there was another battery deeper????? That is why I am looking into this now.
RDF

Mine does the same!

This may have a reset button inside the back , maybe marked a.c. if it does you need to short it with metal tweezers between the battery and the a.c. button.
hope this helps

1
ensure all three of the springs are present
the 2 at the top confirm that the case is closed the on at the bottom sends the sound signal.

2
ensure the metal casing on the back of the movement is not touching the back. and check the movement is correctly seated

if there is a black screen and shows chg thats mean your battery level is to low ////// so you must charge as soon a possible,,,,,,

The watch started working by itself.

good morning ! to set your baby g casio watch , press the adjust button to make digit blinking when the digit blinking you can chagne the digit press the mode button,and next use the two to chagne digit after seting press the adjust button and the time is gona be normal,thanks po !..

wait until the battery is full reloaded