Apple power mac g5 late 2004 User Manual

 
© 2004 Apple Computer, Inc. All rights reserved. 
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Service Source
Troubleshooting 
Power Mac G5 (Late 2004) 

 
Power Mac G5 (Late 2004) Troubleshooting -   
1  
 General Information 
General Information 
DDR Memory 
In the Power Mac G5, PC3200/400 DDR-SDRAM DIMMs must be installed in pairs of 
equal size and speed. Memory from older Macintosh computers is not compatible. Do not 
try to install non-DDR memory as it will not 
fit in the DIMM slots and could cause damage.
The computers ship with a minimum of 256 MB of RAM, provided by a pair of 128 MB 
DIMMs installed in the two DIMM slots marked “1.” You can add...

 
Power Mac G5 (Late 2004) Troubleshooting -   
2  
 General Information 
Results of Mixing PC2100, PC2700, and PC3200 RAM 
The table below describes what happens if you install PC2100, PC2700, or PC3200 
memory in the Power Mac G5 computer.  
PCI and AGP Cards 
Power Mac G5 computers have four expansion card slots, three of which accommodate 
Peripheral Component Interconnect (PCI) cards and one that accepts an advanced 
graphics port (AGP) video card. AGP cards and PCI cards have different connectors,...

Power Mac G5 (Late 2004) Troubleshooting - 3
 General Information
AGP Cards
The AGP video card, installed in slot 1, contains the graphics processor unit (GPU) and 
provides the computer’s display ports. Slot 1 is designed speci fically to accept AGP cards. 
Note:  Certain high-performance AGP graphics cards, when installed in slot 1, block 
access to the adjacent PCI slot. In this case, PCI cards can be installed in slots 3 and 4 
but not in slot 2.
PCI Cards
The remaining three expansion slots, labeled...

Power Mac G5 (Late 2004) Troubleshooting - 4
 General Information
Block Diagram
3535
64
64 3
2
64
32
8
8
8 8
16
3
2
Elastic
Interface
Hyper-
Transport AG
P
PCI
SATA
SATA
EATA 133
PCI
AGP Pro 8x
ADC
64b / 33 MHz PCI
Vesta
5 1/4” Optical 3 1/2” HD
Internal
Speaker
Line out
184 pin Unbuffered DDR DIMM
I2
S
I2 SOptical S/PDIF in 
Optical S/PDIF out
Line in
Bluetooth
Antennas
Rear USB 2.0
Mode
mRJ-11
Front Panel
FireWire 
AFireWire B
Ethernet
RJ-45 USB 2.0
FireWire A
Headphone
Shasta U3 Lite
GPUL...

Power Mac G5 Troubleshooting - 5
 General Information
Resetting the Logic Board
Many system problems can be resolved by resetting the logic board. Because the Power 
Mac G5 (Late 2004) uses a System Management Unit (SMU) controller ch\
ip rather than a 
Power Management Unit (PMU) controller chip, the logic board does not include a reset 
button. Instead, to reset the logic board, do the following:
1. Shut down the computer.
2. Unplug the computer from its power source. 
3. Wait 15 seconds.
4. Plug the...

 

Power Mac G5 (Late 2004) Troubleshooting - 
 
6
 
 General Information
 
Front Panel Board Troubleshooting
 
Certain no power symptoms can sometimes be caused by a failed front panel board or 
power button. However, troubleshooting these parts by swapping them out with known-
good parts can be time-consuming. An alternative approach is to build a simple front panel 
board troubleshooting tool, as illustrated, and then use the procedures described below to 
test the board and button before actually...

 

Power Mac G5 Troubleshooting - 
 
7
 
 General Information4. Remove the black plastic cap covering the 24-pin power supply cable connector (the 
P1 or largest connector). The cap  fits tightly over the connector. To remove it, rock the 
cap gently forward and backward as you lift up.
 
Note:
 
 This is a top view of the connector when it is plugged into the logic board
5. Press the release latch on the power supply connector and disconnect the cable from  the logic board.
6. Plug a known good power...

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...

Power Mac G5 (Late 2004) Troubleshooting - 9
 Symptom Charts 9. Test whether the front panel board or power button is at fault. Remove the installed 
front panel board and swap it for the known-good front panel board in the front panel 
board troubleshooting tool. Then connect the troubleshooting tool to the logic board of 
a known-good Power Mac G5 and start it up using the tool. If the computer does not 
start up correctly, go to step 10. Otherwise, go to step 11.
10. Replace front panel board
11....