I have a powershot SD870 IS. It has a grey dot on the screen about the size of a dime. Also it does not focus either. You can't hear the motor trying to focus the lens and you can see the lens does not move at all. Can it be fixed by someone or is it just a throw away camera. I am a disabled Veitnam vet and it works easliy with my prosthetic. Thank you. JIM
