Intermittent problemsv Follow the suggested actions in the order in which they are listed in the Action column until the problemis solved.v See Chapter 4, “Parts listing, System x3550 M3 Types 4254 and 7944,” on page 159 to determine whichcomponents 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 aTrained service technician.v Go to the IBM support Web site at http://www.ibm.com/systems/support/ to check for technicalinformation, hints, tips, and new device drivers or to submit a request for information.Symptom ActionA problem occurs onlyoccasionally and is difficult todiagnose.1. Make sure that:v All cables and cords are connected securely to the rear of the server andattached devices.v When the server is turned on, air is flowing from the fan grille. If there is noairflow, the fan is not working. This can cause the server to overheat andshut down.2. Check the system-error log or IMM system event log (see “Error logs” on page25).The server resets (restarts)occasionally. 1. If the reset occurs during POST and the POST watchdog timer is enabled (clickSystem Settings --> Integrated Management Module --> POST WatchdogTimer in the Setup utility to see the POST watchdog setting), make sure thatsufficient time is allowed in the watchdog timeout value (POST WatchdogTimer). If the server continues to reset during POST, see “POST” on page 24and “Diagnostic programs and messages” on page 115.2. If the reset occurs after the operating system starts, disable any automaticserver restart (ASR) utilities, such as the IBM Automatic Server Restart IPMIApplication for Windows, or any ASR devices that are be installed.Note: ASR utilities operate as operating-system utilities and are related to theIPMI device driver. If the reset continues to occur after the operating systemstarts, the operating system might have a problem; see “Software problems” onpage 100.3. If neither condition applies, check the system-error log or IMM system-event log(see “Error logs” on page 25).88 IBM System x3550 M3 Types 4254 and 7944: Problem Determination and Service Guide
