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• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• If an action step is preceded by "(Trained technician only)," that step must be performed only by a trained
technician.
• Go to the Lenovo support website at http://www.lenovo.com/support to check for technical information,
hints, tips, and new device drivers or to submit a request for information.
Symptom
If an optional embedded
hypervisor flash device is not
listed in the expected boot
order, does not appear in the
list of boot devices, or a similar
problem has occurred.
Intermittent problems
Use this information to solve intermittent problems.
• Follow the suggested actions in the order in which they are listed in the Action column until the problem is
solved.
• If an action step is preceded by "(Trained technician only)," that step must be performed only by a trained
technician.
• Go to the Lenovo support website at http://www.lenovo.com/support to check for technical information,
hints, tips, and new device drivers or to submit a request for information.
Symptom
A problem occurs only
occasionally and is difficult to
diagnose.
The server resets (restarts)
occasionally.
Keyboard, mouse, or USB-device problems
Use this information to solve keyboard, mouse, or USB-device problems.
Action
1. Make sure that the optional embedded hypervisor flash device is selected on
the boot manager <F12> Select Boot Device at startup.
2. Make sure that the embedded hypervisor flash device is seated in the connector
correctly (see "Removing the USB flash drive" on page 197 and "Installing
the USB flash drive" on page 198).
3. See the documentation that comes with the optional embedded hypervisor
flash device for setup and configuration information.
4. Make sure that other software works on the server.
Action
1. Make sure that:
• All cables and cords are connected securely to the rear of the server and
attached devices.
• When the server is turned on, air is flowing from the fan grille. If there is
no airflow, the fan is not working. This can cause the server to overheat
and shut down.
2. Check the system-error log or IMM event logs (see "Event logs" on page 58).
1. If the reset occurs during POST and the POST watchdog timer is enabled (click
System Settings ➙ Recovery ➙ System Recovery ➙ POST Watchdog Timer
in the Setup utility to see the POST watchdog setting), make sure that sufficient
time is allowed in the watchdog timeout value (POST Watchdog Timer). If the
server continues to reset during POST, see Appendix B "UEFI (POST) error
codes" on page 805 and "Lenovo Dynamic System Analysis" on page 60.
2. If neither condition applies, check the system-error log or IMM system-event
log (see "Event logs" on page 58).
.
Chapter 3
Troubleshooting
65
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Table of Contents
Troubleshooting
