• “Serial device does not work” on page 357
Number of serial ports identified by the operating system is less than the number of installed ports
1. Make sure that:
• Each port is assigned a unique address in the Setup utility and none of the serial ports is disabled.
• The serial-port adapter (if one is present) is seated correctly.
2. Reseat the serial port adapter.
3. Replace the serial port adapter.
Serial device does not work
1. Make sure that:
• The device is compatible with the server.
• The serial port is enabled and is assigned a unique address.
• The device is connected to the correct connector (see “System-board connectors” on page 34).
2. Reseat the following components:
a. Failing serial device
b. Serial cable
3. Replace the following components one at a time, restarting the server each time:
a. Failing serial device
b. Serial cable
4. (Trained technician only) Replace the system board.
Intermittent problems
Use this information to solve intermittent problems.
• “Intermittent external device problems” on page 357
• “Intermittent KVM problems” on page 357
• “Intermittent unexpected reboots” on page 358
Intermittent external device problems
Complete the following steps until the problem is solved.
1. Update the UEFI and XCC firmware to the latest versions.
2. Make sure that the correct device drivers are installed. See the manufacturer's website for
documentation.
3. For a USB device:
a. Make sure that the device is configured correctly.
Restart the server and press F1 to display the Lenovo XClarity Provisioning Manager V3 system
setup interface. Then, click System Settings ➙ Devices and I/O Ports ➙ USB Configuration.
b. Connect the device to another port. If using a USB hub, remove the hub and connect the device
directly to the server. Make sure that the device is configured correctly for the port.
Intermittent KVM problems
Complete the following steps until the problem is solved.
Video problems:
1. Make sure that all cables and the console breakout cable are properly connected and secure.
Chapter 5. Problem determination 357
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