Rear view

• NMI button: Press this button to force a nonmaskable interrupt to the microprocessor. It allows you to blue screen the server and take a memory dump (use this button only when directed by the service support). You might have to use a pen or the end of a straightened paper clip to press the button. The NMI button is in the lower left-hand corner on the rear of the server.
• Power connector: Connect the power cord to this connector.
  Note: Power supply 1 is the default/primary power supply. If power supply 1 fails, you must replace it immediately.
• Video connector: Connect a monitor to this connector. The video connectors on the front and rear of the server can be used simultaneously.
  Note: The maximum video resolution is 1600 x 1200 at 75 Hz.
• Two USB 3.0 connectors : Connect a USB device, such as a USB mouse or keyboard to any of these connectors.
• Systems-management Ethernet connector: Use this connector to connect the server to a network for full systems-management information control. This connector is used only by the IMM2.1. A dedicated management network provides additional security by physically separating the management network traffic from the production network. You can use the Setup Utility to configure the server to use a dedicated systems management network or a shared network. See Using the Setup Utility in the Problem Determination and Service Guide for more information.
• Ethernet connectors: Use either of these connectors to connect the server to a network. When you enable shared Ethernet for IMM2.1 in the Setup Utility, you can access the IMM2.1 using either the Ethernet 1 or the system-management Ethernet (default) connector. See Using the Setup Utility for more information.
• Serial connector (optional): Connect a 9-pin serial device to this connector. The serial port is shared with the IMM2.1. The IMM2.1 can take control of the shared serial port to redirect serial traffic, using Serial over LAN (SOL).

The following illustration shows the LEDs on the rear of the server.

Figure 2. LEDs rear view

The following illustration shows the LEDs on a dc power supply.

• Ethernet activity LEDs: When these LEDs are lit, they indicate that the server is transmitting to or receiving signals from the Ethernet LAN that is connected to the Ethernet port.
• Ethernet link LEDs: When these LEDs are lit, they indicate that there is an active link connection on the 10BASE-T, 100BASE-TX, or 1000BASE-TX interface for the Ethernet port.
• AC power LED: Each hot-swap ac power supply has an ac power LED. When the ac power LED is lit, it indicates that sufficient power is coming into the power supply through the power cord. During typical operation, the ac power LED is lit. For any other combination of LEDs, see AC power-supply LEDs.
• DC power LED: Each hot-swap ac power supply has a dc power LED. When the dc power LED is lit, it indicates that the power supply is supplying adequate dc power to the system. During typical operation, both the ac and dc power LEDs are lit. For any other combination of LEDs, see DC power-supply LEDs.
• IN OK power LED: Each hot-swap dc power supply has an IN OK power LED. When the IN OK power LED is lit, it indicates that sufficient power is coming into the power supply through the power cord. During typical operation, both the IN OK and OUT OK power LEDs are lit. For any other combination of LEDs, see DC power-supply LEDs.
• OUT OK power LED: Each hot-swap dc power supply has an OUT OK power LED. When the OUT OK power LED is lit, it indicates that the power supply is supplying adequate dc power to the system. During typical operation, both the IN OK and OUT OK power LEDs are lit. For any other combination of LEDs, see DC power-supply LEDs.
• Power-supply error LED: When the power-supply error LED is lit, it indicates that the power supply has failed.
  Note: Power supply 1 is the default/primary power supply. If power supply 1 fails, you must replace the power supply immediately.
• Power-on LED: When this LED is lit and not flashing, it indicates that the server is turned on. The states of the power-on LED are as follows:
  • Off: Power is not present, or the power supply or the LED itself has failed.
  • Flashing rapidly (4 times per second): The server is turned off and is not ready to be turned on. The power-control button is disabled. This will last approximately 5 to 10 seconds.
  • Flashing slowly (once per second): The server is turned off and is ready to be turned on. You can press the power-control button to turn on the server.
  • Lit: The server is turned on.
• System-locator LED: Use this LED to visually locate the server among other servers. You can use Lenovo XClarity Administrator to light this LED remotely.
• System-error LED: When this LED is lit, it indicates that a system error has occurred. An LED on the LCD system information display panel (if available) is also lit to help isolate the error.