I've had a Canon PowerShot SD800 IS for nearly three years and it's handled all my abuse (moderate exaggeration) like a champ. Today I turned it on and found that the image preview on the LCD, and therefore the photos taken, were practically monochrome with a strong purple tint. It's not the screen; photos I've taken previously show up fine in playback mode. I tried all the white balance settings, and no fancy color effects are on. Is the image sensor dead, or is it fixable in some way? If it's the former, I need a new camera. As much as I want a DSLR, I need a tiny camera I can just throw in my pocket or backpack. Any recommendations?Good low-light/no-flash performance and manual shutter speed and aperture would be a plus.