RE: Need help putting together a brushless Vendetta ST
You could try reversing the servo plug on the radio receiver to see if that does anything. You can also get a nice aftermarket servo (Hitec makes decent ones - get metal gears) for probably close of the cost of shipping on returning yours. If there is a local hobby shop in your area, you could go there and have them test the servo and receiver for you and pick up a new servo there if that is the problem.