The demo mode occurs when the camera either does NOT have a memory card in it, or the memory card is locked or defective. The demo mode allows the camera to take one image.
The solutions:
1. Be sure the memory card is properly installed and the card is not full. Try taking a few photos.
2. Check to see if the little switch on the side of the memory card is on "lock". If it is, move the switch to "unlock". Try taking a few photos.
3. Replace the memory card if the above two fail but follow directions for #1 and #2 and take a few photos.
If the above does not work for you, it may be that the camera is defective or the internal contacts for the memory card are dirty or damaged. In this case, it's a trip to the repair shop.
Go to menu then custom settings and disengage demo mode
you may alsotake battery and sd card out then try loading again push shutter button down it may reset.
SOURCE: Nikon D40 Memory Card Error
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.
SOURCE: memory card won't stay in
Make sure you push in firmly untill it clicks . Make sure its an SD card Too.
SOURCE: Nikon D3100 - how to
For Quick Response Mode and other Release Modes, please see "image1":
image 1
For remote control shooting or Bulb mode, see "image2":
image 2
SOURCE: I have a new D3100.
I believe that the memory card was not formatted to the camera before using so, the pictures were corrupted and unable to read in either the computer or back in the camera. What you need to do is make sure the memory card is unlocked here is a diagram
Diagram 
Make sure the card is unlocked then you need to format the card.
SOURCE: I have a Nikon D3100
Hello mehran_vafae, is supposed to have put a DX lens.
The mode dial, select in what way is going to take a picture.
You can make combinations according to the mode set in the mode dial, with the Fn key / command dial, command dial / aperture A mode, command dial / shutter speed S mode, Full Auto / + / - compensation sw, etc. ..
Please carefully read the user manual supplied with your camera and if it fails take them to Nikon service.
Regards
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