Try to disconnect the signal cable, use a brush to clean both the cable and its connector on the motherboard then make sure the signal cable is well position from the hinges and connect it back. Then try again
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Try to disconnect the signal cable, use a brush to clean both the cable and its connector on the motherboard then make sure the signal cable is well position from the hinges and connect it back. Then test it again.
Try to disconnect the signal cable, use a brush to clean both the cable and its connector on the motherboard then make sure the signal cable is well position from the hinges and connect it back. Then try again