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 4, “Parts listing, Types 4255, 7945, and 7949 server,” on page 157 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.
v Go to the IBM support Web site at http://www.ibm.com/systems/support/ to check for technical
information, hints, tips, and new device drivers or to submit a request for information.
Symptom Action
A problem occurs only
occasionally and is difficult to
diagnose.
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 system event log or IMM event log (see “Event logs” on page 26).
3. Make sure that the server and IMM firmware has been updated to the most
recent code levels.
4. Review the operating system logs.
5. Contact your operating-system vendor to set up any available tools that are
capable of monitoring the server.
6. If an error occurs, run the DSA program and forward the results to IBM service
and support for analysis.
7. See “Solving undetermined problems” on page 154.
The server resets (restarts)
occasionally.
1. If the reset occurs during POST and the POST watchdog timer is enabled (click
Advanced Setup --> Integrated Management Module (IMM) Setting --> IMM
Post Watchdog in the Setup utility to see the POST watchdog setting), make
sure that sufficient time is allowed in the watchdog timeout value (IMM POST
Watchdog Timeout). See the Installation and User’s Guide for information
about the settings in the Setup utility.
If the server continues to reset during POST, see “POST” on page 26 and
“Diagnostic programs, messages, and error codes” on page 72.
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 any ASR devices that are 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 61.
3. If neither condition applies, check the system-event log (see “Event logs” on
page 26).
Chapter 3. Diagnostics 47
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