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The No Signal message can be caused by the TV's Input being changed, the HDMI cable failing, or the Mainboard (possibly) having failed.
Unplug the power cord from the back of the Fire TV box.
Disconnect and reconnect the HDMI cable between them on both ends- making sure it is secure.
Plug the Fire box back into AC and once it's rebooted turn the TV on, and use the INPUT button on the original TV remote to select the correct HDMI Input.
Let me know what happens.
If you still have no luck, then postback with the model number off of the back of the TV and we can proceed.
Do you need further assistance with this?