Won't take a picture

Ruth this sounds like the CCD unit went bad, have a camera tech take a quick look at it to find out for sure.

The CCD is bad or the Iris is shut stuck. If it's the Iris just stuck, it might just have moisture - leave the camera in a dry place for a day. If it's the CCD - pretty much "kiss-it-good-bye". To replace the CCD is expensive - get a new camera.

Sound like the sensor or recoding electronics are bad. The camera is most likely beyond economical repair and I would buy a new one.

http://www.fixya.com/support/r3771170-phone_water_damage

A stuck shutter is another common failure mode for digital cameras. The symptoms of a stuck or "sticky" shutter are very similar to CCD image sensor failure. The camera may take black pictures (for shutter stuck closed), or the pictures may be very bright and overexposed, especially when taken outdoors (for shutter stuck open).

To confirm a stuck shutter, put the camera in any mode other than "Auto", and turn the flash OFF (you don't want to blind yourself for the next step). Next look down the lens and take a picture. You should see a tiny flicker in the center of the lens as the shutter opens and closes. If no movement is seen, then you likely have a stuck shutter. If so, please see this link for further info and a simple fix that may help.

Make sure that you read the reader's comments there for other techniques that may work if the outlined steps in the article don't. Also, please leave a comment there on how the fixes worked, or may not have worked for you.

When you say you can view pictures. Do you mean you can view them on the lcd on the camera itself or on your computer? It sounds like the CCD chip went bad most likely. If its not under warranty I would consider purchasing a new camera.
Thank you,
Lee

Hi,
Its problem of defective CCD Imager in your Canon A75 camera and CCD Imager will be replaced.
Canon will repair it free of cost as per announced scheme.
Click Canon CCD Imager Advisory for details.
Good luck.

My 4300 works fine until this week. No picture display on the LCD screen. Settings like date, exposure, etc.. are fine on the LCD screen. Able to get into setup mode and the colour menu selection box is fine. This shows that the LCD screen is working fine. Prior to this happening, I notice that when I took pictures in zoom mode, the picture turn out to be orange. I suspect this is caused by electronic failure. Light entering the lens cannot be transmitted to the LCD screen. Some photoelectronic stuff had reached its MTBF (mean time between failure)? Is there a way to save this camera?

the photo sensing device should be displaced from its actual position.......we cannot make it sit in proper position...better take it to a service centre

You checked the obvious, lens cover? (sorry had to ask) any grinding noises when you take a picture or focus\zoom?