Wirless Digital Box HDMI Port not working

Recently I have been trying to use my Telus Wireless Digital Box to watch shows but when I plug it in it says no signal all the lights on the front work. I have tried multiple different cables and tried it with different TVs. I also have a main Telus PVR Box which works fine. also, the signal strength is good. wireless Digital Box Model Number: UIW4001. Help!