With nothing plugged in but the AC power supply, no track wires, or cab cables, you should have a solid red light on the booster and a solid green light on the matching power supply. Anything other than that indicates a problem with the power supply or the booster. Send both in for testing.
If the either of the lights blink, change color, or go out when you plug in the two pin track connecter (with your layout wiring attached) you have a short in your wiring. remove the short and try again.