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Intermittent problems
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, Type 7942 server," on page 37 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
A problem occurs only
occasionally and is difficult to
diagnose.
The server resets (restarts)
occasionally.
Action
1. Make sure that:
v All cables and cords are connected securely to the rear of the server and
attached devices.
v When the server is turned on, air is flowing from the fan grille. If there is no
airflow, the fans are not working. This can cause the server to overheat and
shut down.
2. Check the event log or BMC system event log (see "Error logs" on page 87).
3. See "Solving undetermined problems" on page 110.
1. If the reset occurs during POST and the BMC watchdog timer is enabled (click
Advanced --> IPMI Configuration--> BMC Watchdog Timer Action in the
BIOS Setup Utility program to see the BMC watchdog setting), make sure that
sufficient time is allowed in the watchdog timeout value.
If the server continues to reset during POST, see "POST" on page 83 and
"Diagnostic programs and messages" on page 105.
2. If the reset occurs after the operating system starts, disable any automatic
server restart (ASR) utilities, such as the IBM Automatic Server Restart IPMI
Application for Windows, or ASR devices that may be installed.
Note: ASR utilities operate as operating-system utilities and are related to the
IPMI device driver.
If the reset continues to occur after the operating system starts, the operating
system might have a problem; see "Software problems" on page 104.
3. If neither condition applies, check the event log or BMC system event log (see
"Error logs" on page 87).
95
Chapter 5. Diagnostics
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