Xbox One X Power on question

I have an interesting issue with my Xbox One X. I have a HMDI cable that lights up when being used to show a good connection. Have used it in many other devices including a different X1X. However, If I plug in the power cord the light goes out. It will flicker, then go out. Machine will beep on, but no white light from the RF board. Fan spins, but then stops. No picture. Have tried different HDMI and power cords, same results. Any advice?