User`s guide

Xserve Troubleshooting - 7
General Information
4. 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 supply.
If you do measure +3.3V on pin 9, the power supply is likely OK. Go to the next step
for further verification.
6. Connect the black lead of the volt meter to pin 14 of the power supply connector;
connect the red lead to pin 4. The volt meter should measure approximately +5V.
If you do not get a reading of +5V, recheck the volt meter connections and measure
the voltage again. If voltage is still not present, replace the power supply.
If you do measure +5V on pin 4, the power supply is likely OK. Go to the next step for
further verification.
7. Connect the black lead of the volt meter to pin 14 of the power supply connector;
connect the red lead to pin 3. The volt meter should measure approximately +12V.
If you do not get a reading of +12V, recheck the volt meter connections and measure
the voltage again. If voltage is still not present, replace the power supply.
If you do measure +12V on pin 3, the power supply is OK and the testing is complete.
You have verified that the power supply is not the cause of the “no apparent power”
symptom.
RAM and Processor Verification: Power-On 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 lights will flash in the following ways:
• 2 Flashes: No RAM is installed or detected.
• 3 Flashes: Incompatible RAM types are installed.
• 4 Flashes: No RAM banks passed memory testing.
• 5 Flashes: No good boot images are detected in the boot ROM (and/or there is a bad
sys config block).
• 6 Flashes: The processor is not usable.