OK you can send back this headboard and we will send a new one to you. But before that I want to confirm whether it is the headboard issue or not. Have you measure the voltage of the headboard, mainboard and power supply? The LED light of decoder board is not blinking, maybe there is no signal from headboard to printhead. Besides, you can directly connect the printhead and headboard instead of connecting the decoder board. If the printhead can work then we can confirm the decoder board is failed. If you have any feedback, please feel free to contact us. Thank you for your attention.