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Archived - About the Power Mac G5 (Late 2005) diagnostic LEDs

Power Mac G5 (Late 2005) computers have six or seven built-in diagnostic LEDs on the main logic board that can help Apple Authorized Service Providers (AASPs) troubleshoot certain issues. These LEDs are located to the left of the top bank of DIMM connectors (where your computer's RAM is installed):

This article has been archived and is no longer updated by Apple.




 

1 LED #1 5 LED #5
2 LED #2 6 LED #6 (Only present in Quad processor models)
3 LED #3 7 LED #7
4 LED #4 8 Edge of logic board
  9 Top bank of DIMM slots

Normally, all LEDs should be off. When you remove the air deflector shield, the third, fourth, and fifth LEDs may turn on. If they're still on when you replace the air deflector shield, remove and then reposition the shield.

Note: LED 7 will momentarily flash when the power button is pressed during start up. This is normal behavior.

Here's a look at what LED light statuses you should pay attention to, and what you should do if you see them:

1 Red Contact Apple or an Apple Authorized Service Provider
2 Red Contact Apple or an Apple Authorized Service Provider
3 Red The air deflector shield is not in place or not closed properly. Reseat the air deflector.
4 Yellow The air deflector shield is not in place or not closed properly. Reseat the air deflector.
5 Green The air deflector shield is not in place or not closed properly. Reseat the air deflector.
6 (Quad models only) Red Contact Apple or an Apple Authorized Service Provider
7 Red Contact Apple or an Apple Authorized Service Provider

(If you're checking out your logic board, you may notice two other LEDs—one to the right of the top bank of DIMMs, and one near the bottom edge. These two LEDs were only used in manufacturing, and you can safely ignore them.)

In addition to the LEDs on the logic board, the power light LED on the front of the computer can offer additional diagnostic information:



1 Front panel LED

Here are the power light's various statuses and what this LED is telling you:

On and solid Computer is on and running
2 flashes, pause No memory (RAM) is installed
3 flashes, pause Incompatible memory (RAM) is installed
4 flashes, pause No good DIMM banks detected
5 or 6 flashes, pause Contact Apple or an Apple Authorized Service Provider
Last Modified: Dec 17, 2013
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  • Last Modified: Dec 17, 2013
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