[Sohaib]

We had a problem with speed controllers malfunctioning last year. Drive the robot forward at full speed (and assuming your using the kit Talon SR Motor Controllers) the light should be solid green when moving forward at full speed. Do this on blocks so you can observe the lights easier. If you have one of the lights on the motor controllers for the left side are different from the rest, your problem is either a connection, or the motor controller itself.