Microprocessor 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, Types 4255, 7945, and 7949 server,” on page 157 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 ActionThe server goes directly to thePOST Event Viewer whenturned on.1. Correct any errors that are indicated by the LEDs (see “Light path diagnosticsLEDs” on page 65).2. Make sure that the server supports all the microprocessors and that themicroprocessors match in speed and cache size. To compare themicroprocessor information, run the Setup utility and select SystemInformation, then select System Summary , and then Processor Details.3. (Trained service technician only) Reseat the microprocessors.4. (Trained service technician only) Remove microprocessor 2 and restart theserver.5. (Trained service technician only) Replace the following components, in theorder shown, restarting the server each time:v Microprocessorsv System boardMonitor or video problemsSome IBM monitors have their own self-tests. If you suspect a problem with yourmonitor, see the documentation that comes with the monitor for instructions fortesting and adjusting the monitor. If you cannot diagnose the problem, call forservice.v 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, Types 4255, 7945, and 7949 server,” on page 157 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 ActionTesting the monitor. 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 adifferent server.4. Run the diagnostic programs (see “Running the diagnostic programs” on page72). If the monitor passes the diagnostic programs, the problem might be avideo device driver.5. (Trained service technician only) Replace the system boardChapter 3. Diagnostics 51
