My nikon d40 displays "shutter button deactivated, recharge battery".but i charged the battery, my camera still wont work.help please

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.