Origineel bericht door: Charles ,
Exact same problem, which happened after a HDD replacement to SSD on a late 2009 iMac. I salvaged the circuit board from the old drive to keep the HDD temp sensor in the circuit to control the fan speed. The display blackout started almost immediately after replacement. I replaced the LCD temp sensor but to no avail. I wonder if the apple built-in diagnostic process looks for a delta between the various temp sensors and shuts down the display if there is too wide a disparity between them? Thinking of trying the inline digital thermal sensor cable from OWC.