Apple xserve early 2008 User Manual

Xserve (Late 2006) Troubleshooting — General Information 131
Selecting an Alternative Startup Method from the Front Panel
You can use the Xserve’s front panel controls to choose from optional startup methods that 
might be helpful in special circumstances.
To choose an alternative startup method from the front panel:With the power off, hold in the system identifier button while you press the on/standby 
1.  
button.
Continue to hold in the system identifier button until the top row of blue lights blinks...

Xserve (Late 2006) Troubleshooting — General Information 13 2
Resetting the Logic Board 
System Management Controller (SMC) Reset
The System Management Controller (SMC) is a chip on the logic board that controls all power 
functions for the Xserve. If the Xserve is experiencing any power issue, resetting the SMC may 
resolve it. The SMC controls several functions, including: Telling the Xserve when to turn on, turn off, sleep, wake, idle, and so forth 
• 
Handling system resets from various commands 
•...

Xserve (Late 2006) Troubleshooting — General Information 13 3
Unplug the AC power cord. 
2.  
Remove the battery for at least 20 seconds.
3. 
Reinstall the battery and wait 5 seconds, then press the power button on the front panel to 
4.  
start up the Xserve.
You will need to re-set the system date and time to the current date and time since these 
5. 
parameters will be reset when the RTC is reset.
System Reset 
The Xserve has a system reset switch on the logic board that may be used to restart the...

Xserve (Late 2006) Troubleshooting — General Information 134
Diagnostic LEDs
The logic board includes three sets of LEDs to help service providers troubleshoot the Xserve:System status LEDs (1 in the illustration below)
• 
CPU status LEDs (2 in the illustration below)
• 
EFI POST LEDs (3 in the illustration below)
• 
The LEDs are located toward the rear of the logic board. You must remove the top cover of the 
Xserve for the diagnostic LEDs to function.
Refer to the charts and information on the...

Xserve (Late 2006) Troubleshooting — General Information 13 5
System Status LEDs
LocationNameNormal State Indicates
DS9C3 SLEEPON (Red) System is in sleep mode.
DS9C4 5VSTBYON Power supply is providing trickle power.
DS9C5 EFI_GDNormally OFF; only 
flashes during boot 
cycle Normal sequence indicates control has passed 
from EFI operations to the OS. If light stays on 
after boot cycle, EFI is crashing.
DS9C6 VR_PWRON System is powered on.
DS9C3: SLEEP
Important: The red DS9C3 LED warns that the Xserve...

Xserve (Late 2006) Troubleshooting — General Information 13 6
CPU Status LEDs
LocationName Normal StateIndicates
DS9C1 CPUB_OVERTMP OFFCPU B is operating at the right temperature.
DS9C2 CPUA_OVERTMP OFFCPU A is operating at the right temperature.
DS9C7 CPUB_HLTH OFFCPU B is operating correctly.
DS9C8 CPUA_HLTH OFFCPU A is operating correctly.
Note: Under normal operating conditions, the CPU status LEDs are all OFF; however, there may be 
exceptions. Refer to KnowledgeBase article ????
DS9C1: CPUB_OVERTMP...

Xserve (Late 2006) Troubleshooting — General Information 13 7
Memory Diagnostic LEDs
The Xserve (Late 2006) logic board includes diagnostic LEDs for each FB-DIMM. Each of the LEDs 
will light if it detects an issue with the corresponding installed FB-DIMM. These LEDs will also 
flash briefly when the computer is started up or shut down and when it goes in and out of sleep 
mode. This is normal behavior.
Troubleshooting:Shutdown and restart the computer. 
• 
Try reseating the FB-DIMMs. 
• 
Check memory...

Xserve (Late 2006) Troubleshooting — General Information 13 8
Power Supply Verification
To power on, the Xserve’s logic board requires “trickle” power. If the system fails to power on, 
first reset the SMC as described in this chapter. If the Xserve still doesn’t power on, follow the 
procedure outlined below to determine whether the issue is related to the power supply.
Verify trickle power
Diagnostic LED DS9C4 (5VSTBY ) indicates the presence of trickle power required by the logic 
board to begin the...

Xserve (Late 2006) Troubleshooting — General Information 13 9
Front Panel Status Lights 
The Xserve’s status lights are shown in the figure below.
Drive module
ac tivit y ligh t
Driv
e module
status ligh t Optical driv
e
System identifier
button/ligh t
Enclosure lock
and status ligh t
FireWire 400
po rt
On/standby button
and ligh t
Drive Module
bays (3)
Ether
net link ligh t
(P or t 1) Ether
net link ligh t
(P or t 2)
System ac tivity
lights
Note: The front bezel of the Xserve (Early 2008) model is...

Xserve (Late 2006) Troubleshooting — General Information 140
System identifier button and light
The system identifier light flashes if a problem is detected. You can also turn it on manually 
by pressing the button or turn it on remotely using Server Monitor. This indicator is useful for 
locating a particular unit in a rack with more than one Xserve. A second system identifier button 
and light are on the rear panel.
Ethernet link lights
Two lights indicate whether the Xserve is connected to an Ethernet...