Lenovo NeXtScale nx360 M5 Installation And Service Manual page 86

• 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
Testing the monitor.
The screen is blank.
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Lenovo NeXtScale nx360 M5 water-cooled technology tray Lenovo NeXtScale n1200 Enclosure Installation and Service Guide
Action
1. Make sure that the monitor cables are firmly connected.
2. Try using a different monitor on the server, or try using the monitor that is being
tested on a different server.
3. Run the diagnostic programs. If the monitor passes the diagnostic programs,
the problem might be a video device driver.
4. (Trained technician only) Replace the system board.
1. If the server is attached to a KVM switch, bypass the KVM switch to eliminate it
as a possible cause of the problem: connect the monitor cable directly to the
correct connector on the rear of the server.
2. The IMM2 remote presence function is disabled if you install an optional video
adapter. To use the IMM2 remote presence function, remove the optional video
adapter.
3. If the server installed with the graphical adapters while turning on the server, the
Lenovo logo displays on the screen after approximately 3 minutes. This is
normal operation while the system loads.
4. Make sure that:
• The server is turned on. If there is no power to the server, see "Power
problems" on page 75.
• The monitor cables are connected correctly.
• The monitor is turned on and the brightness and contrast controls are
adjusted correctly.
5. Make sure that the correct server is controlling the monitor, if applicable.
6. Make sure that damaged server firmware is not affecting the video; see
"Updating the firmware" on page 31.
7. Observe the checkpoint LEDs on the system board; if the codes are changing,
go to step 6.
8. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. Monitor
b. Video adapter (if one is installed)
c. (Trained technician only) System board.
9. See "Solving undetermined problems" on page 80.