Power Supply Verification

If the server fails to power on, first 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 specific pins, make sure the power supply remains securely plugged into its connector on the logic board. The following figure shows the pins and voltage on the server's power supply connector, as viewed from above when it is connected to the...

Entering Firmware Boot Commands From the Front Panel

You can use the system identifier button on the Xserve G5 server's front panel to initiate a limited number of firmware 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 ID button and a specific light on the front panel. Note If Open Firmware Security is turned on for the system, front panel mode is not available. In this situation, the two rows of lights on the front panel flash...

Error Lights

Xserve Rear Panel

Note Error lights flash before system software loads. Server activity lights flash two times at startup Two flashes 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. 3. Run Xserve Remote Diagnostics. Be sure to run XRD 1.0.2 or later if 2 GB DIMMs are installed. If the test finds 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 board....

Preliminary Steps

Before you begin, make sure the drives are in the unlocked position. No other preliminary steps are required. You can replace or install hard drives while the server is running you do not need to shut down or open the server first. Note There are two LED indicators on the front of each drive. The upper LED shows drive status a green light indicates the drive is good a yellow or red light indicates the drive should be replaced. The lower LED shows drive activity when the light is blinking, the...

RAM and Processor Verification PowerOn Self Test

A power-on self test in the server's ROM automatically runs whenever the server is started up after being fully shut down the test does not run if the server is only restarted . If the test detects a problem, you will not see a normal sequence of system activity lights on the front panel during startup. Instead, the Power light will flash in the following ways 1 Flash No RAM is installed or detected. 2 Flashes Incompatible RAM types are installed. 3 Flashes No RAM banks passed memory testing. 4...

Startup

System is completely dead no blower movement and power LED is not lit 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. Verify the power outlet is good. 4. Disconnect external devices, including the monitor, and start up the server. 5. Remove internal PCI and PCI-X cards and start up the server. 6. Verify that the power supply is properly connected to the logic board. 7. Verify the...

Diagnostic Tools

Xserve System Identifier Light

Xserve G5 includes built-in sensors that report on hard drives, internal temperature, fan status failure, and power status failure. These sensors allow you to monitor the server's operation via indicator lights on the front of the server and remote monitoring software. The server's status lights are shown in the figure and table below. While the illustration is based on Xserve G5, the callouts for the status lights are also accurate for Xserve G5 Cluster Node . System Identifier Button Light...

Resetting the PMU on the Logic Board

The PMU Power Management Unit is a microcontroller chip that controls all power functions for the server. The PMU is a computer within a computer. Its function is to tell the server to turn on, turn off, sleep, wake, idle, etc. manage system resets from various commands. maintain parameter RAM PRAM . manage the real-time clock. Important Be very careful when handling the logic board. The PMU is very sensitive and touching the circuitry on the logic board can cause the PMU to crash. If the PMU...