I have a casio cpw 310 watch and the battery seemed to be dying so I bought a new battery a energizer 399/395 and replaced the battery, but since then the screen of the watch is blank.

That certainly wouldn't hurt - be sure you use good new batteries.

Hi,
Did you take your Casio to a pro or it was just a normal battery replacement service?.

I am asking because if a pro did it seems he forgot to reset your Casio watch when battery was replaced.
This is a must when you change battery on a Casio digital watch.

Take it again and ask for a complete reset, if they know what they are doing they will do as you ask without questioning.


Casio Watches

Remove the back of the case. Remove the dead battery. Replace with a new battery. Close case back set time and your all set till it dies again.

go> http://support.casio.com/en/manual/manuallist.php?cid=009

click this link for the manual
http://www.usersmanualguide.com/manuals/casio/qw1044,1244.pdf

Try your nearest Casio watch shop. If they cannot do it for you, they should be able to tell you who can.

Casio Parts Department1-800-223-2001

Parts DistributorsThis list is subject to change without notice.
Official Parts Distributors Listing.
California
Pacific Coast Parts Dist. Inc.
15024 Staff Court., Gardena, CA 90248
Tel: 310-515-0207, 800-421-5080
Fax: 800-782-5747
www.pacparts.com
[email protected]
New York
American Perfit Crystal
520 8th Ave., New York, NY 10018
Tel: 212-246-8292 (NY), 800-345-0537 (Outside NYC)
Fax: 212-265-4085
www.americanperfit.com
[email protected]

I have the same watche you can find the manual here :
http://www.usersmanualguide.com/casio/watches/qw-1044

Guys, I just realised that there is a mark called AC on the back of the module next to a gold small circle pad. Once you change the battery, you need to connect a wire or paperclip or something similar between the back or positive of the battery and the pad, it should then come alive. Good luck