How to troubleshoot my AR Drone 2.0 leds and message errors?

AR Drone 2.0 boot sequence I know that's suppose to happen.

Steps:

1. Connect the battery then it goes through

the propellers sequence and leds

turn green and main board is green as well. Status OK!

2. Then with smartphone connect using wifi

to Drone. Status OK!

3. Open the Freeflight tap on piloting and

with the AR Drone 2.0 in my hand and I

hit launch button and the motors start for

a few secs then cuts off.

Motors starts Status OK but that's it!

Things I thought to fix:

I replaced a motor and the problem is still there.

Need help with "What is the boot sequence to troubleshoot" drone 2.0?