My Nikon D40 keeps saying Shutter released disabled. Recharge battery. I have two batteries and both are charged. I took it to a Ritz Camera store and they said it cant read my battery. Is there anything i can do to fix it or should i send it in?
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If you are using the same battery, it could be it has reached the end of life. The charger can indicate the battery is fully charged, because the voltage has reached a correct level, but still the battery can have one or more bad cells. So as soon as you start using the battery, it can lose enough energy to give this nasty message. If you put in another battery and still have the same message, there must be a serious problem in the camera.
To check your battery, just after the camera has given this message, with a multi meter. You will see the voltage has dropped at least 1,2 volt beneath the voltage printed on the battery. The typical 7 volt Nikon battery, will give 8 volt on the multi meter. But placed in the camera it will drop to 7 volt. If the multi meter reading is less then 7 volt it has at least one bad cell and should be replaced.
Hard to say for sure without more detail, but there is a website out there that advertises online quotes for camera repair, and any problem on a D40 comes back with a price of $180. Considering that you can buy D40 bodies on ebay for around $250, it will for sure be less than that.
A couple of things to try, and if these don't work you will probably need to have it serviced.
1. There is a reset button which may fix it. It's described on the first page of "Troubleshooting" in your manual. The camera diagrams at the front of your manual will help you find it, near the connector cover.
2. If it doesn't work after the reset button, pull the battery out and leave it out for two days, then put it back and try again.