Specifications

8 - Power Mac G5 Troubleshooting
Symptom Charts
Symptom Charts
How to Use the Symptom Charts
The Symptom Charts included in this chapter will help you diagnose specific 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 module before you
proceed to the next cure.
Important: The only way to shut off power completely to the computer and display is to
disconnect their power plugs from the power source. Make sure the power cords to the
computer and display are within easy reach.
Startup Failures
When testing a computer for the following symptoms, remove the side access panel so
you can better observe or listen for fan movement.
Note: For more information on startup failures related to mixing incorrect versions of
DIMMs, see the chart on page 2 of this chapter.
Power-on LED does not illuminate when power button is pressed, fans do not
spin, and there is no boot tone or video
1. Verify power outlet is good
2. Replace power cord
3. Reset the logic board. Refer to “Resetting the Logic Board” in this chapter.
4. Verify power supply cables are fully connected
5. Check for trickle voltage on the power supply connector. Refer to “Power Supply
Verification” in this chapter. If verification fails, replace power supply.
6. Reseat front panel board cable
7. Replace front panel board cable
8. Test the front panel board and power button using the front panel board
troubleshooting tool. Refer to “Front Panel Board Troubleshooting” in this chapter. If
the computer starts up correctly, go to step 9. Otherwise, go to step 12.