If you are using stock cords, and the light will fire when unplugging from the receiver, then the cord is OK, and the light is OK. If the LED turns red when recieving a signal, then the transmitter is OK. This leaves the reciever, which will need to come in for repair. As of now, all CyberSync products are under warranty, so there is no charge for the repair. Please visit this link for more information on repairs:
http://www.alienbees.com/contact.html#repair or please contact our Customer Service department at 1-800-443-5542 or
info@paulcbuff.com TS