When ever i press photo click button my camera shuts down. It works fine when viewing photo. Even when i gentel press dat button to go on photo taking mode the camera goes down. Even I can video on clickng the photo shoot button.

Turn the camera on and look into the view finder while you try to press the shutter button. Check the information in the view finder to see whether you are getting an error message. If you see an error message in the view finder, remove the lens cap and proceed to take a photograph but, instead of pressing the shutter button this time, press the button near the top of the camera on the back which says "AF/AE. If the camera takes the photo it means you have somehow initiated the auto focus/auto exposure lock which the camera will not override when attempting to take a photo using the shutter button. When you use the AF/AE button, you override this system. To remedy this issue, when you get the error message try pressing the shutter button again. Also, remove the lens to see if the shutter inside has frozen in the "locked" position. If you find this to be the case you will need to contact Nikon Customer Support. The link for Nikon Support is below. The numbers are half-way down the page.

http://support.nikonusa.com/app/answers/detail/a_id/238

Try changing the battery brand and see if this helps..I seem to have the same issue with my camera with certain battery brands..Solved my problem by switching brands..

To view them on the camera lcd screen, press the playback button (green arrow in a green box, 2nd button down to the right of the screen) and then scroll through them one by one using the left and right buttons on the thumb pad. If you press the up and down buttons the image will advance forward and back by ten pictures each time.

To view them on a tv, turn the camera off and connect the video cable supplied with the camera to your tv input terminal (yellow). Turn the camera on set the tv to display the input feed and then use the camera playback button as before.

To view them on a computer, you'll need to upload them to the computer first. The best way is to turn the camera off and remove the memory card, and then insert it into a memory card reader connected to your computer. The computer will then prompt you to upload and display the images.

For full camera instructions from Olympus, click here.

For basic operating instructions, click here.

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The on/off and picture buttons are run from a little ribbon strip that fits under the main pcb. I have pics to help you. Just click on "THE ONLY WAY I KNOW HOW " In the tips & tricks section for my email address.
Thanks

hi...ensure  that the camera is turned on. If applicable, ensure the lens cover has been removed before taking pictures. the LCD backlight is turned on by pressing the DISPLAY button several times until the screen appears.  Depending on the camera model, the DISPLAY button may be labeled as DISP or with a display icon. This button could be a standalone button or it depends upon the camera model..... 
If operating the camera with a battery, ensure the battery is fully charged. 
Ensure the battery is inserted properly in the camera. 
If operating the camera with the power adapter, ensure it is plugged into a working AC outlet. 
Ensure no Audio/Video (A/V) cables are connected for viewing pictures on a TV; the LCD screen will not display when an A/V cable is connected. 
Perform a reset procedure on the camera....

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You mean SD400 camera doesn't show any error sign and it just doesn't have live view to shoot picture?
If yes, its problem of bad CCD imager and Canon will provide free of cost repair facility for SD400 camera.
Click Canon CCD Advisory for details.

I am having the same problem with my camera. I have to take the batteries out to get it to shut down. I also cannot view my photos on the camera, when I try to turn it to view, it goes to shoot mode.

Sounds like your 'preview' feature has been turned off in your camera settings. With the camera turned 'on,' press: "Menu," then press the joystick button until you reach the pencil, which is your, "Custom Setting Menu." Then press down on your joystick to reach, "Image Review." Now press the joystick to the right to select, "Image Review," and press up on the joystick to get to, "Image Review On," and then press, "OK." If that doesn't do it, please let us know.

1. Set camera to playback mode and turn on.
2. Push "W" on zoom button (zoom out). (this will show you the index card)
3. Press the delete button (garbage can button)
4. Choose the top option "All In This Folder"
5. Confirm choice.

I was having the same problem and tried several set of new batteries. Finally I purchased a set of high performance lithium batteries and the camera works on them. Before trying to get repairs or buying a new camera try spending $15 on the best batteries you can find.