Hi Rolando,
The buzzing is probably a servo under load, it will burn out if you keep doing it.
Firstly you need to tell us what you have we know it is a T-Rex 450 but what is it Fly Barred or Fly-Barless, what servos are you using, what Transmitter & Receiver, what FBL system if it is Fly-barless, armed with this information we may have a better under standing of your problems.
Also have you looked through Tony's setup videos, they may solve your problems.