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You can either use a PC cord to connect the flash and camera, or you can use a remote trigger to fire the flash cordlessly. Your local camera store should be able to provide options for both.
The Nikon D40 uses the EN-EL9 7.4 Volt Li-ion Battery. You should be able to read 7.4 V DC between the (+) & (-) terminals of the battery after it has been in the charger for several hours. If it does not, it indicates a bad battery, charger or both. There should over 7.4 V DC on the terminals of the charger if there isn't, it suggests a bad charger. If the battery voltage is OK, make sure it is inserted correctly. If still having trouble, it may be related to the camera power switch or internal circuitry. This will require returning to Nikon for repair. Good luck!
Remove the battery & completely disconnect the camera from any cables. Now charge/replace the battery & try switching it on again. If it still fails to turn on & you have fully charged the battery then you should take it to a Camera shop for them to test. Alternatively, purchase a new battery to use in the camera.
connect the mini usb calbe to Camera only. Camera will working like without cable. Go to setup menu and Change USB setting to P, PTP. the unplug the miniusb and hopefully camera will work as it one.
If the battery is ok it suggests the charger unit is faulty.
If still under warranty, your supplier should exchange this free.
If out of warranty, I suggest buying a standalone battery charger to charge your battery without connecting the camera (and maybe a spare battery - always handy to carry a spare with you).
Hello. Make sure the write-protect switch on the SD card is in the UP (nearer to the contacts) position. Try the card in an SDHC capable reader on your computer first. Note that the SD card can only be inserted one way - make sure you're not putting it in upside-down! If the computer recognizes the presence of inserted card (whether it can read it or not), format it at FAT32. When finished, remove properly (icon in system tray) and insert into your D40 slot, WITH THE CAMERA OFF!! Turn on the D40, and if it now recognizes the SD card, FORMAT it again, in the camera. Good luck.
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