I have a phantom 3 advanced that hit a tree and fell to the ground. Now when I power up my drone the camera does nothing. Replaced main ribbon cable and still nothing at all. Any suggestions for trouble shooting what may be wrong

Sorry for your crash,harleyultra.dr.
It's not recommended to repair or change any part of the aircraft by yourself, I think a repair service would be the best course of action.
You could get in touch with our tech support via support.us@dji.com.
They will guide you to send it in for fixing.

There has to be some help to figure this out does anyone have ideas

harleyultra.dr Posted at 2016-10-21 06:00
There has to be some help to figure this out does anyone have ideas

Maybe some parts were damaged when hit a tree and fell down, that can be evaluated by our engineers.
You could contact our tech support through e-mail as Mindy suggested. Our engineers will help you handle it properly.