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Origineel bericht door: Charles ,

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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.

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