b. If the drive passes the diagnostic tests but is still not recognized, complete the following steps:
1) Replace the drive.
2) Replace the hard drive backplane (see “Remove the 2.5-inch drive backplane” on page 28 )).
3) Replace the system-board assembly (see “Remove and replace the system-board assembly” on
page 82 ).
Intermittent problems
Use this information to solve intermittent problems.
• “Intermittent external device problems” on page 102
• “Intermittent KVM problems” on page 102
• “Intermittent unexpected reboots” on page 102
Intermittent external device problems
Complete the following steps until the problem is solved.
1. Make sure that the correct device drivers are installed. See the manufacturer's website for
documentation.
2. For a USB device:
a. Restart the compute node and press F1 to display the Lenovo XClarity Provisioning Manager 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 compute node. 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.
2. Make sure that the monitor is working properly by testing it on another compute node.
3. Test the console breakout cable on a working compute node to ensure that it is operating properly.
Replace the console breakout cable if it is defective.
Keyboard problems:
Make sure that all cables and the console breakout cable are properly connected and secure.
Mouse problems:
Make sure that all cables and the console breakout cable are properly connected and secure.
Intermittent unexpected reboots
Note: Some correctable errors require that the compute node reboot so that it can disable a device, such as
a memory DIMM or a processor to allow the machine to boot up properly.
Complete the following steps until the problem is solved.
1. See the management controller event log to check for an event code that indicates a reboot. See “Event
logs” on page 95 for information about viewing the event log.
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ThinkSystem SN550 Compute Node Maintenance Manual
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