Won't Take Pictures

When I turn the camera on, the lens extends and everything seems normal, but it won't do anything. The LCD screen or the Viewfinder only show a black screen with all the display settings. There is no image of what the lens should be "seeing." If I hold down the shutter release button, SB and a flashing RED circle appear. In addition, there is a constant flashing symbol--a white circle with hands like 9:00 and a white dot at number 3 on a clock face.
Same problem as the other person. LCD screen only shows menu items is black and doesn't show what you are aiming at. I have changed batteries and pretty much pushed every button on it. I have deleted all pictures from scan disc.