I was being a smart ass..
you need to give us all kinds of info i we will have any chance of diagnosing your problem blindly over the internet..
So lets start off with a few questions:
-How do you know you have an ESC problem? What is it not doing properly?
-What ESC,MOTOR and Battery are you using?
-What are you using it in?
-Whats your gear ratio?
-Is your drive train free?
-Do you have proper gear mesh between the pinion and spur gear?
-Did you get it wet?
-Does it smell burnt?
-Does the motor smell burnt?
-Does it light up any of its lights?
-Does the motor rotate at all?
-Does the servo operate?
-Are all the wires securely plugged in or soldered?
-Have you tried to reprogram it?
Anyway give us as much info as you can...