Apple Xserve User Manual

6 - Xserve Troubleshooting
 General Information
Power Supply VeriÞcation
To power on, the serverÕs logic board requires a ÒtrickleÓ power of +5V. If the system fails to 
power on, Þrst reset the PMU. Then follow the procedure outlined below to determine 
whether the problem is related to the power supply.
Note: To verify the power supply, you need a volt meter. When connecting the volt meter 
leads to speciÞc pins, make sure the power supply remains securely plugged into its 
connector on the logic...

Xserve Troubleshooting - 7
 General Information4. Check to see if the power supply fan is spinning.
If it is not, replace the power supply. If it is spinning, go to the next step.
5. Connect the black lead of the volt meter to pin 14 of the power supply connector; 
connect the red lead to pin 9. The volt meter should measure approximately +3.3V.
If you do not get a reading of +3.3V, recheck the volt meter connections and measure 
the voltage again. If voltage is still not present, replace the power...

8 - Xserve Troubleshooting
 General Information
Xserve (Slot Load and Cluster Node): Entering Firmware Boot 
Commands From the Front Panel
You can use the system identiÞer button on the Xserve (Slot Load) and Xserve (Cluster 
Node) serverÕs front panel to initiate a limited number of Þrmware commands to the 
system without connecting a keyboard or monitor to the server. The commands are listed 
below; you enter each command with a combination of the system identiÞer button and a 
speciÞc light on the...

Xserve Troubleshooting - 9
 General Information
Status Lights
The serverÕs status lights are shown in the Þgure and table below. While the illustration is 
based on the original Xserve, the callouts for the status lights are accurate for all models.
Table 1: Status Lights
Indicator Color Description
Power White On and OK
Security lock Yellow Lock is engaged
System identiÞer Yellow Indicates a hardware error in the server or 
that someone has toggled it on; check the 
server monitoring application for...

10 - Xserve Troubleshooting
 General Information
Remote Monitoring
Server Monitor is an application installed with Xserve system software that helps you 
monitor the following information about the server:
¥ installed operating system
¥ drive status and activity
¥ power supply operation
¥ enclosure and processor temperature
¥ blower operation
¥ security
¥ network operation
You can also use Server Monitor to get logs of activity and Apple System ProÞler reports 
on remote servers.
Apple Hardware Test...

Xserve Troubleshooting - 11
 General InformationAll Error Code Lists are included in the Service Diagnostics Matrix, Knowledge Base 
article 112125. You can also access this matrix by clicking the Service Diagnostics rollover 
link under any of the product areas on the Service Source home page.
Apple Service Diagnostic
Apple Service Diagnostic replaces MacTest Pro for Xserve. It tests memory, logic board 
and components, hard drives, Ethernet cards, and video cards, and complements both 
Apple Hardware...

12 - Xserve Troubleshooting
Startup Symptom Charts
Symptom Charts
How to Use the Symptom Charts
The Symptom Charts included in this chapter will help you diagnose speciÞc symptoms 
related to the product. Because cures are listed on the charts in the order of most likely 
solution, try the cures in the order presented. Verify whether or not the product continues 
to exhibit the symptom. If the symptom persists, try the next cure. 
Note:  If a cure instructs you to replace a module, reinstall the original...

Xserve Troubleshooting - 13
Startup Symptom Charts16. Replace the logic board. Note: When installing the new logic board, make sure the 
ports and ID button on the back of the board align with the openings in the chassis.
Memory error message appears on the screen
1. Reseat the DIMMs. 
2. Verify that the correct SDRAM DIMMs are installed. 
3. Run Apple Hardware Test. If the test Þnds bad memory, replace the DIMMs one at a 
time and test until all bad DIMMs are replaced with known-good modules.
Flashing...

14 - Xserve Troubleshooting
Startup Symptom Charts 4. Reseat the front panel board and cable connectors.
5. Replace the front panel board.
6. Replace the logic board. Note: When installing the new logic board, make sure the 
ports and ID button on the back of the board align with the openings in the chassis.
System shuts down intermittently
1. Verify that the system ID button on the back of the logic board aligns with the 
opening in the chassis back panel. If it does not, realign the logic board.
2....

Xserve Troubleshooting - 15
Error Lights Symptom Charts
Error Lights
Note: Error lights ßash before system software loads.
Server activity lights ßash two times at startup
Two ßashes mean that no RAM is installed or detected.
1. If no DIMM is present, install a known-good DIMM in the top slot and try again. 
2. Reseat the DIMMs.
3. Run Apple Hardware Test. If the test Þnds bad memory, replace the DIMMs one at a 
time and test until all bad DIMMs are replaced with known-good modules.
4. Replace the logic...