It sounds like the BMC cable is not connected or is damaged. Review Steps 10 - 14 in this guide [guide|135185]. Make sure the ZIF connector latches are set and the ribbon cable is fully and squarely inserted.
+
It sounds like the BMU cable is not connected or is damaged. Review Steps 10 - 14 in this guide [guide|135185]. Make sure the ZIF connector latches are set and the ribbon cable is fully and squarely inserted.
+
+
If you need to replace the cable the Apple P/N is 923-03932 - BMU Flex Cable
It sounds like the BMC cable is not connected or is damaged. Review Steps 10 - 14 in this guide [guide|135185]. Make sure the ZIF connector latches are set and the ribbon cable is fully and squarely inserted.