green flashing means what fault?

[jeepster_apc]

I have a CS650. When the on button is pressed, it beeps then all LEDs flash. When I release the button, the green continues to flash for about 2 seconds, then goes out.
The brief user's manual does not describe this case.
What is wrong?

[BillP · Accepted solution]

Mick,

Whenever the BackUPS is turned on it goes into a process which we call as a self-test. During the self-test process, the Online LED would be flashing green. With the way you have described it, I can only think of two things it is either a bad UPS or a bad battery.