Problem with watch

The back has to come off in order to replace the battery. To loosen the stuck screw wet the tip of a cotton swap/Q-tip with WD40 (don't overdo it) and press it on the screw so that it seeps in between the screw and the back plate. Let it do its work for some 10 minutes and try to turn the screw. Use a watch maintenance screwdriver that fits well to prevent damaging the little screw.

A decade late but it uses 2x SR927W

remove battery and wait about two minuteslook http://www.pmwf.com/Watches/Casio/FirstMemoryProtectReset.htmand for other casio watches

browse through my tips and you will find link for all Casio watch manual downloads.

When you open the case there are two very small springs that may be lost if you are not carefull.
One of it is used to make electric contact with the piezo speaker in the back plate.
Replace it and the sound wil return.
Good luck.

DONT THROW IT AWAY THAT IS A COLLECTORS ITEM... You can get it taken care of at www.casiowatchrepair.com or call them toll free 877.659.0761 and have them take care of it, the watch will be as good as new.

Follow this link:

http://world.casio.com/wat/download/en/manual/

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If your databank is like mine (DB-35H), there is a TINY spring in a really unusual spot that you probably didn't notice that fell out. Laying the watch face down and with the back off, there is a little tiny hole in the back towards one of the corners. (sorry, already put my watch back together and didn't notice which corner.) There is a tiny (1/16" x 1/4") spring that sits upright in that hole. It must make a contact with the metal cover. I replaced my battery and when I did, a spring fell out. I looked all over the internet, then wrote Casio, who said they didn't have access to the information about where the spring went. (Doh!) I got a used DB-35H from my brother and was going to swap the innards when I noticed the spring on his. Put my spring back and it beeps! If you've lost the spring, don't know if you can fake it with tinfoil or not, but it really is a TINY spring. Good luck.

I think it said in the manual that you had to use metal tweezers to reset the thing. Check the manual again under the changing battery section.

take out the battery and clean under it and the area it is supposed to be settled in.Clean with rubbing alcohol.