Réponse à : « Sensor Error After Hard Disk Replacement »I got this same error but did not replace the HD. Mac won't start. It began showing the flashing folder with a question mark. I looked this up, pressed "R" to do a reset. It started and failed to do the reset. I tried again and again and still showed the folder. It did respond when I pressed "D" to do a test. Hence this exact error. Would this mean the HD would have to be replaced?