3. If the computer hangs with a POST error, go to theChapter 7, “Symptom-to-FRU index,” on page 99.4. If the computer hangs and no error is displayed, go to“Undetermined problems” on page 116.5. Power supply problems, see Chapter 7,“Symptom-to-FRU index,” on page 99.6. Safety information, see “Safety information” on page125.7. For intermittent problems, check the error log; see“POST error messages” on page 12.1. IS THE SYSTEM PART OF A CLUSTER?YES. Schedule maintenance with the customer. Shut downall systems related to the cluster. Run storage test.NO. Go to step 2.2. IF THE SYSTEM IS NOT PART OF A CLUSTER:v Power-off the computer and all external devices.v Check all cables and power cords.v Set all display controls to the middle position.v Power-on all external devices.v Power-on the computer.v Record any POST error messages displayed on thescreen. If an error is displayed, look up the first errorin the “POST error codes” on page 110.v Check the System Error Log. If an error wasrecorded by the system, see Chapter 7,“Symptom-to-FRU index,” on page 99.v Start the Diagnostic Programs. See “Diagnosticprograms and error messages” on page 13.v Check for the following responses:a. One beep.b. Readable instructions or the Main Menu.3. DID YOU RECEIVE BOTH OF THE CORRECTRESPONSES?NO. Find the failure symptom in Chapter 7,“Symptom-to-FRU index,” on page 99.YES. Run the Diagnostic Programs. If necessary, refer to“Diagnostic programs and error messages” on page 13.If you receive an error, go to Chapter 7, “Symptom-to-FRUindex,” on page 99.If the diagnostics completed successfully and you stillsuspect a problem, see “Undetermined problems” on page116.2 Hardware Maintenance Manual: xSeries 200
