Lenovo ThinkServer RD120 Hardware Maintenance Manual page 171

v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v See Chapter 3, "Parts listing, ThinkServer RD120 Machine Types 6444, 6445, 6446, and 6447," on page 25
to determine which components are customer replaceable units (CRU) and which components are field
replaceable units (FRU).
v If an action step is preceded by "(Trained service technician only)," that step must be performed only by a
trained service technician.
Symptom
Testing the monitor.
The screen is blank.
The monitor works when you
turn on the server, but the
screen goes blank when you
start some application
programs.
Action
1. Make sure that the monitor cables are firmly connected.
2. Try using the other video port.
3. Try using a different monitor on the server, or try testing the monitor on a
different server.
4. Run the diagnostic programs (see "Running the diagnostic programs" on page
168). If the monitor passes the diagnostic programs, the problem might be a
video device driver.
5. Reseat the Remote Supervisor Adapter II SlimLine (if one is present).
6. Replace the following components one at a time, in the order shown, restarting
the server each time:
a. Remote Supervisor Adapter II SlimLine (if one is present)
b. (Trained service technician only) 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. Make sure that:
v The server is turned on. If there is no power to the server, see "Power
problems" on page 155.
v The monitor cables are connected correctly.
v The monitor is turned on and the brightness and contrast controls are
adjusted correctly.
v No beep codes sound when the server is turned on.
Important: In some memory configurations, the 3-3-3 beep code might sound
during POST, followed by a blank monitor screen. If this occurs and the Boot
Fail Count option in the Start Options of the Configuration/Setup Utility
program is enabled, you must restart the server three times to reset the
configuration settings to the default configuration (the memory connector or
bank of connectors enabled).
3. Make sure that the correct server is controlling the monitor, if applicable.
4. Make sure that damaged BIOS code is not affecting the video; see "Recovering
the BIOS code" on page 181 for information about recovering from a BIOS
failure.
5. See "Solving undetermined problems" on page 194 for information about
solving undetermined problems.
1. Make sure that:
v The application program is not setting a display mode that is higher than the
capability of the monitor.
v You installed the necessary device drivers for the application.
2. Run video diagnostics (see "Running the diagnostic programs" on page 168).
v If the server passes the video diagnostics, the video is good; see "Solving
undetermined problems" on page 194 for information about solving
undetermined problems.
153
Chapter 5. Diagnostics