IF there is any visible damage, please describe it. Especially describe the LED lights you see (or if you don't see any), and any beeps you hear. If you can provide a video, that is really helpful.
Unless you can provide additional information, I would speculate that the camera behavior you described suggests the accident did NOT rip out the 3 black wires that are the common crash result associated with this camera. That's actually bad news. It means the issue is deeper than most.
However, if any/all of the three black wires are pulled loose, you can try powering up the camera with the pigtail that came in your kit. The pigtail was provided as a backup in case the three black "hot shoe" wires get pulled out clean. Just be sure the remains of the wires are not in contact with each other or anything else. Look closely (tough without pulling the top off the board) to see if any of the board tracing got ripped out and can make contact with anything else.
Again, if all 3 wires are intact, installing the pigtail isn't likely to help. They do the same thing.
I really hope someone else can provide some schematics or a good manual. I've looked before. Yuneec seems to keep the real technical information pretty "close to the chest". You can't blame them much, it's the keys to their business.