my guess is your 3 in 1 is fried. There are two ESC's in the 3 in 1.....1 for the main rotor and 1 for the tail motor. My guess is you ether fryed it when you switched the plugs or maybe when you hit idle up if your throttle stick was all the way down. Bummer, I recomend installing a couple fuses one 7.5amp for the main motor and a 3amp for the tail to prevent damage to the ESC's in the future.