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LEDs and buttons on the front operator panel

The front operator panel of the server provides controls, connectors, and LEDs.

Diagnostics panel with an LCD display is available for some models. For details, see Integrated Diagnostics Panel and External diagnostics handset.
Figure 1. Front operator panel
Graphic that depicts the diagnostics panel of the server. It includes callouts to identify each of the components on the Diagnostics panel.

1 Power button with power status LED

You can press the power button to power on the server when you finish setting up the server. You also can hold the power button for several seconds to power off the server if you cannot shut down the server from the operating system. The power status LED helps you determine the current power status.
Solid onGreenThe server is on and running.
Slow blinking (about one flash per second)GreenThe server is off and is ready to be powered on (standby state).
Fast blinking (about four flashes per second)Green
  • The server is off, but the XClarity Controller is initializing, and the server is not ready to be powered on.

  • System-board-assembly power has failed.

OffNonePower is not present, or the power supply has failed.

2 Network activity LED

Compatibility of the NIC adapter and the network activity LED

NIC adapterNetwork activity LED
OCP moduleSupport
PCIe NIC adapterNot support
When an OCP module is installed, the network activity LED on the front I/O module helps you identify the network connectivity and activity. If no OCP module is installed, this LED is off.
OnGreenThe server is connected to a network.
BlinkingGreenThe network is connected and active.
OffNoneThe server is disconnected from the network.
If the network activity LED is off when an OCP 3.0 module is installed, check the network ports in the rear of your server to determine which port is disconnected.

3 System ID button with system ID LED

Use this system ID button and the blue system ID LED to visually locate the server. A system ID LED is also located on the rear of the server. Each time you press the system ID button, the state of both the system ID LEDs changes. The LEDs can be changed to on, blinking, or off. You can also use the Lenovo XClarity Controller or a remote management program to change the state of the system ID LEDs to assist in visually locating the server among other servers.

If the XClarity Controller USB connector is set to have both the USB 2.0 function and XClarity Controller management function, you can press the system ID button for three seconds to switch between the two functions.

4 System error LED

The system error LED helps you to determine if there are any system errors.

OnYellowAn error has been detected on the server. Causes might include but are not limited to the following errors:
  • The temperature of the server reached the non-critical temperature threshold.

  • The voltage of the server reached the non-critical voltage threshold.

  • A fan has been detected to be running at low speed.

  • A hot-swap fan has been removed.

  • The power supply has a critical error.

  • The power supply is not connected to the power.

  • A processor error.

  • A system I/O board or processor board error.

  • Abnormal status is detected on the Liquid to Air Module (L2AM) or Direct Water Cooling Module (DWCM).

  • Check the Lenovo XClarity Controller event log and the system event log to determine the exact cause of the error.

  • Check if additional LEDs in the server are lit. It will direct you to the error source. See Troubleshooting by system LEDs and diagnostics display.

  • Save the log if necessary.

For server models with L2AM installed, it is required to open the top cover to check the status of liquid detection sensor module LED. For more instructions, see LED on the leak detection sensor module.
OffNoneThe server is off or the server is on and is working correctly.None.