I have a velineon brushless system that will not go in reverse. I have tried resetting the esc. I have changed it to all three settings and still no reverse. What's going on. Thanks for the help.

Have you checked to make certain you don't have it in racing mode which has no reverse?

Check the profiles also does it have full power in forward? The no reverse/50% forward power is a classic sign that the esc is toast.