If the link to the PCIe switch is not operating in PCIe v3 mode, this LED will blink. During startup, this indicates that the system has reached EFI Boot. #8: PCIe Switch Status: This indicates the status of the link from the PCIe switch on the I/O Board to the CPU. If, during startup, this LED illuminates without S0 illuminating, it may indicate an issue. It should illuminate at the same time as the S0 LED.
#7: S4 Power State: This indicates that the S4 (hibernate) state is available. It will illuminate once the computer begins the startup sequence, but does not necessarily indicate that computer has successfully started up. #6: S0 Power State: This indicates that the S0 (full power) state is available. If the computer is scheduled to turn on at a certain time in the Energy Saver preference pane, this LED will still illuminate after the computer has been shut down. It will illuminate at all power states, until the computer is fully shut down. #5: S5 Power State: This indicates that the S5 (soft power off) state is available. During startup, this indicates that the system can transition to EFI Boot. #4: Platform Reset Release: This indicates that the system has transitioned to a fully running power state (S0). If high-power USB or Thunderbolt devices are connected prior to sleep, this LED will remain illuminated during sleep. It should illuminate once the power button has been pressed, and should remain on while the system is powered on and not in sleep mode. #3: 12V Power: This indicates 12V main system power. It should remain illuminated whenever AC power is connected. #2: 11V Power: This indicates 11V power from the power supply. Check the mezzanine connectors on both the logic board and I/O board to be sure the connections are fully seated. #1: Flex Check: This indicates that there is a connection issue between the logic board and the I/O board. Avoid contact with I/O board bus bars and bus bar screws:
The bus bars and the bus bar screws, located at the top of the main boards, have enough energy to cause a burn if they are bridged with metal (such as a ring or other jewelry). Warning: To prevent injury, avoid contact with the bus bars and the bus bar screws (shown below) when the computer is plugged in and powered on. Remove the AC power cord and all cables and peripherals that might be connected to the system. For the purpose of viewing diagnostic LEDs only, it is possible to briefly operate the computer with the housing removed.įrom the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).
#Mac pro power supply jumper mac#
Using Diagnostic LEDs for Troubleshooting The Mac Pro (Late 2013) contains a Hall Effect sensor that will prevent operation of the computer with the housing removed. This type of LED is only found on the CPU riser card.
#Mac pro power supply jumper Pc#
The analytics platform estimates that PC and Mac gaming will reach $40 billion, the same as last year.Warning LEDs are yellow, and illuminate continuously when a thermal problem is detected. Sony deepening its ties in PC gaming allows the Tokyo-based company to expand its reach in a global gaming market that is projected to reach $222 billion in 2022, per Data.ai.
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