There are a great deal of settings that can cause these unexpected results. Most of them are the result of the inability to focus when in any of the auto focus modes.
It may be a good time to do a RESET on the camera to restore the settings to factory defaults. This can be done by pressing and holding the 2 buttons with GREEN DOTS for a few seconds. One button is on the lower left of the rear display and the other is on top - near the shutter release button. You can download and read about this reset feature in the manual on page 11.
Additionally, you can read a review and learn about some helpful settings to try on your D40 here. I hope this was helpful!
Have you checked the display mode you're in? If you have the display set to off (to save power) and also the picture review time set to off, then you'll just see a black screen. Try pressing the 'Disp.' button below the screen when the camera is on - it should cycle through different settings with each press: Off, On, On with picture info. Similarly, in the playback mode this will show you more or less info about the picture you are viewing.
Even if the display is switched off, if you have your 'review' option in the menu set to anything other than Off (i.e. 2 seconds), then you should see the picture you've taken appear on the screen straight after taking it.
If it's not that, then I don't know the answer....
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