I recently had to switch flight controllers because one had fried. When I switched to the new fc, I found that it came with a 8 pin harness to connect my 4 in 1 esc to the fc. I had to re pin a few cables but when I tried to plug a battery in, I only got 3 beeps from the esc and no lights on the fc, rx, or tx. When I plug it into the computer however, I got power. I then provided to try to solder jumpers from the battery leads of the esc to the vbat and ground pads underneath the 8 pin connector. I still have the same problem. I am not sure what else to do, any help would be appreciated.