Canon PowerShot A640 User Manual page 6

Indicators
The camera indicators will light or blink under the following conditions.
Never do the following while the green indicator blinks.
These actions may corrupt image data.
- Shake or jolt the camera
- Shut off the power, or open the memory card slot/battery cover
Upper Indicator
Green:
Blinking Green:
Orange:
Blinking Orange: Ready to shoot (camera shake warning),
Lower Indicator
Yellow:
Blinking Yellow:
4
Ready to shoot
Image recording/reading/erasing/transferring
(when connected to a computer)
Ready to shoot (flash on)
charging flash
Macro mode/Manual focus mode/AF lock mode
Focusing difficulty (camera beeps once)