What the viewfinder indicators mean on a PowerShot SD990 IS.
Indicators
Green: Ready to shoot (camera beeps twice)/ Ready to communicate (during a computer connection)/display off.
Blinking Green: Camera starting up / Time Lapse (movie) recording / Image recording/ reading / erasing / transferring (when connected to a computer / printer)
Orange: Ready to shoot (flash on)
Blinking Orange: Ready to shoot (camera shake warning)
Yellow: Macro, Landscape, Auto Focus Lock, or Manual Focus is being used.
Yellow Blinking: Focusing difficulty.