Answer to: 4sns/1/c0000008 : taop -- 124TA0P is for Ambient Temperature Sensor T = Temperature A = Ambient Temperature It is likely that your sensor is dead. OR, if you opened up the computer, you might have connected the connector in the wrong direction. I did not believe that it can be connected wrong way, but it did and I learned the hard way. And, the names on the the board are not visible when the wire is connected, because it is written below the wire near the connector. On Mid 2011, 27 inch this two wire connector (Ambient Temperature Sensor) is on the main board on the bottom left side near the fan.