iMac (24-inch Mid 2007) Take Apart — Symptom Charts 229
Machine Loud, Fails Apple Hardware Test for HD Temp Sensor
Make sure the LCD temp sensor cable is connected to the sensor on the back, top right side 1.
of the LCD panel. You may have to peel back the foam gasket to see the connector.
Make sure the LCD temp sensor cable is fully inserted into the connector on the bottom left 2.
corner of the logic board.