The PowerMac G5 is a desktop computer first produced in 2003 by the Apple Corporation. This guide will review the repair process of an Apple PowerMac G5 model number A1047 EMC 2061 from 2004. It was discontinued in 2006 as part of the Intel switch first to developers then consumers.

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Can't boot up power mac g5

I have power mac g5 (2003), it is 2.0GHZ dual processor and running 10.5.8, some time boot up, but some time can't boot up. I try use the Install CD/DVD that came with my system to boot up , I got same result some time it boot up, some time can't boot up. please help me and let me know why?

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There are diagnostic lights on the logic board please take a look at them and tell us what they are showing.

Location Name Color Status Indicates

LED 1 Yellow On Yes Power supply is providing trickle power

LED 2 Red Off No CPU B halts on an IERR (instruction error)

LED 3 Red Off No CPU A halts on an IERR (instruction error)

LED 4 Red Off No CPU B is over temperature

LED 5 Red Off No CPU A is over temperature

LED 6 Green On Yes EFI has configured the graphics card

LED 7 Power on Green On Yes All power rails are functioning

LED 8 EFI done Green On Yes EFI is done loading GPU present

CPU A (lower



CPU B (lower



CPU A (upper



CPU B (lower





LED Button

to Display

436 Troubleshooting a Mac Pro

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my g5 don't have diagnostic lights on the logic board.


Diagnostic LEDs

The Mac Pro logic board includes a set of LEDs to help service providers

troubleshoot the computer. The LEDs are located toward the rear of the logic

board, under the memory cage, next to PCI card slot 1. You can view these

LEDs by removing the computer’s side access panel and looking through the

memory cage to the logic board below. Diagnostic LEDs location on the logic board, numbered 1–8 from left to right

LEDs 2, 3, 4, and 5 are normally off and will illuminate automatically if an

error occurs. To read LEDs 1, 6, 7, and 8, you must press the DIAG_LED

button, which is adjacent to the LEDs. To press the DIAG_LED button, use

the nylon probe tool.

NOTE There is a position on the logic board next to LED 1 for a SLEEP

LED that does not have any LED installed. This is normal; the LED was

used only in development. To determine if a Mac Pro computer is in sleep

mode, watch the power LED on the front of the computer. It will slowly

change brightness levels if the computer is sleeping.


I didnt see any LEDs other then the power light, does the 2003 model have them on the board?


You can resolve many system problems by resetting the logic board.

There are three reset switches on the logic board that you can use to troubleshoot

various issues:

SMC reset: If the computer is experiencing a power issue, resetting the

system management controller (SMC) may resolve it.

RTC reset: If the computer is experiencing a booting issue, resetting the

Real Time Clock (RTC) may resolve it.

System reset: You can use this switch to determine if a computer that

won’t consistently boot from a cold start has power supply issues.


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