"It seems that your Tx is not config properly. There are mix on throttle or ch3 is not throttle.
in pic 1 : is throttle full?
in pic 2 : what is the position of throttle?"

"Hello Escobar,
It seems that your Futaba Tx enters the failsafe mode.
check in failsafe option if throttle faisafe is activated.
Best"

"Fisrt of all if your ESCs aren't calibrated properly you can't flight safe.
Before autotune your PID your quad has to be able flight in alt hold mode (stabilize mode work also for autotune). No vibration, no trim in Tx, for autotune, follow this:…"

"Hi Gleen,
it seems that your first quad hadn't ESCs calibrated properly.
And the second hadn't good PID or your frame is too soft or over powered. Check your vibration curves (http://ardupilot.org/copter/docs/common-measuring-vibration.html)
I've…"

"Thank Tony,
Maybe you'd help me understand why i couldn't do autotune with AC3.3. I think you get us on the right way...
When i downgrade to AC3.1.5 i can arm easier and do autotune."

"Hi,
same issues for my Pixhawk 2 FC from goodluckybuy.com. Also My GPS M8Nis very less sensible (can not fixe if i'm slightly in indoor) compare to my other M6N (from another vendor). I then open the case of the M8N and see that the patch antenna…"

"Hi Leo,
it seems that your 3 positions switch is not configured. These 2 postes will help:
http://diydrones.com/profiles/blogs/configuring-turnigy-9x-with-ard...
http://diydrones.com/profiles/blogs/mode-switch-setup-for-turnigy-1
good luck"

"Hi Chester,
If you have 3s LiPo, you should hear ending 3 bips from your ESC, that means power is OK.
What happens when you try to arm your Nova?
For locking GPS i think you must wait some while for detecting enough satellites.
good luck"

"Hi Chester,
check your transmitter if throttle is minimum."