OK people I have investigated why 1 out of 5 Terraminers have only one working board. It appears that the power cable (red) that is soldered to the board is compromised by a rather shoddy soldering job and has come seperated from the board. This can cause a fire (in one case smoke eminated from the Terraminer) or can make contact with the metal casing and electrocute anyone coming into contact with the miner. I have pictures and can prove that this is the case and I also have access to the same Terraminer. Please be careful to remove these units to a place away from children or pets.