Pin 7 of cable CN7.
NO Replace the power supply unit.
YES Replace the Program ROMs on the main logic board.
Is the problem resolved?
YES End of procedure.
NO Replace the main logic board.
Is the problem resolved?
YES End of procedure.
NO Replace the interface connector board.
Is the problem resolved?
YES End of procedure.
NO Replace the cable connected to CN6 on the main logic board.
Is the problem resolved?
YES End of procedure.
NO Contact Technical Support.
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