It doesn't sound like a shutter problem, especially since the G12 doesn't actually have a mechanical shutter. It sounds as though there is either an exposure setting issue when the camera is in Manual mode or one of the other settings that will allow you to take a photo no matter the conditions. If it does the same thing when in full automatic there could be issues with flash or flash compensation or an internal issue. When it happens again, check to see that the camera has not accidently slipped into another mode.
SOURCE: pictures get over exposed with horizontal lines in canon A470
it means there is some dead pixel in the screen. you can change one lcd screen and buy then fix it by yourself.
here is the links for the lcd screen,maybe it can help you!
http://skiliwah.en.alibaba.com/product/475587936-210827720/LCD_Display_Screen_for_Canon_Powershot_A470_Digital_Camera.html
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