Hi, I have a canon 20D and I am having trouble wiht it. It will only take a picture as soon as I turn the camera on and then it will lock up. The display screen is also not working and will only display the one picture I take. I have tried pressing the "menu" button while it is showing me the one picture. Please help. I am not photographer but would love to use the camera and it not sit in the closet in non working condition. thanks!