I saw in another thread that you have an on/off switch in between the ESC and receiver. That's your problem!

The on/off switch only connects the + and - wires, not the signal wire. No signal, no worky...

BTW, if your ESC is defective but is still new, Great Planes WILL replace it, no questions asked, no matter how long you've had it. However, your ESC isn't defective.