Hello everyone, I checked around the forums and couldn't find a similar issue. Im having a lot of problem with my phantom. A few months ago it crashed from a high height. I had for wait for months just for the parts to come in stock. Just had to replace the body and two motors. I also order a gimbal from goodluckbuy. So I fixed everything back up and attached my gimbal. Then I updated to 3.16 and loaded the custom parameters and calibrated my tx. Everything was working fine, it would fly good in ATTI Mode, I didn't try GPS yet because my compass MOD is too low around 300 and nothing seems to fix that. Anyways back to the story I landed my phantom to change the battery and after changing it, turned it back on... turn on the motors but the phantom wont lift. I took it back home.. calibrated the compass and tx, both basic and advanced many times.. make sure I'm running on QuadRotorX, loaded the custom controller parameters. My gains and everything are set to stock. Basically checked everything possible to the problem. And now I even updated to 4.00 and did a motor test. My motors are in the correct position. Theres a youtube video that has the exact same problem as mine check out this video http://www.youtube.com/watch?v=GBtjJMosLNU to know what I'm talking about. So basically I've tried everything to fix this issue.. when I turn on the motors and go past 50% it still wont lift.. It is not receiving enough thrust/power. I have a goodluckbuy gimbal attached to it as well.. but I am sure that is not the problem or could it be? I even opened up the tx controller to see if anything is wrong inside but no solution. Can anyone please help me? I have tried everything but no luck. I want to start flying again, Thanks.