Apple power mac g5 User Manual

Power Mac G5 Troubleshooting 187

Power-on LED illuminates when power button is pressed, fans spin, and boot tone 
chimes, but there is no video
Reseat video card. (Make sure video card is fully inserted in connector and end of card is 
secured by the connector latch.)
Reset PRAM (restart computer while holding down Command-Option-P-R keys until second 
boot tone chimes)
Replace video card
Reset logic board. Refer to “Resetting the PMU on the Logic Board” in this chapter.
Replace logic board
Power-on...

188 Power Mac G5 Troubleshooting

Startup Failures for Power Mac G5 (June 2004 Dual 2.5 GHz/
Early 2005 Dual 2.7 GHz)
Power-on LED illuminates when power button is pressed but fans do not spin (or 
spin only momentarily) and there is no boot tone or video
Reseat video card. (Make sure video card is fully inserted in connector and end of card is 
secured by the connector latch.)
Reset logic board. Refer to “Resetting the PMU on the Logic Board” in this chapter.
Verify power supply cables are fully...

Power Mac G5 Troubleshooting 189

Power-on LED illuminates, fans and processor pump run harder, there is no boot 
and the system shuts down within a few minutes
Remove the processor and look for loss of fluid on the absorbent liner on top of the power 
supply. If you see drops of fluid, replace the processor, otherwise go on to the next step.
Reseat the processor. 
Replace the processor
Replace the logic board
Replace the power supply
Fluid leak is suspected and the computer is plugged in
Unplug the...

190 Power Mac G5 Troubleshooting

Fans  
Individual fan failure
Replace fan 
Exception: The drive fan and blower located between the optical and hard drives cannot be 
replaced. You must replace the enclosure for these two parts.
Replace logic board
All fans run at high speed
Run Apple Service Diagnostic (refer to “Thermal Calibration” earlier in this chapter).
Media bay fans run at high speed
Note: If any of the following three conditions cannot be verified, the red LED on the logic board 
near the...

Power Mac G5 Troubleshooting 191

Other Failures
Duct door sensor 
Reseat interlock sensor board cable
Replace interlock sensor board
Replace logic board
Replace enclosure
Hard drive (kernel panics, hard drive does not mount, or performance slows when 
second hard drive is installed)
Replace hard drive guide screws
Replace hard drive
Optical drive 
Replace optical drive cable
Replace optical drive
Replace logic board
FireWire port (front panel A) 
Reseat front panel board cable.
Replace front panel...

192 Power Mac G5 Troubleshooting
Internal speakers (high-pitch tone) 
Replace power supply
Replace logic board
USB 2.0 (front port) 
Replace front panel board cable
Replace front panel board
Replace logic board
USB 2.0 (rear-top port or rear bottom port)
Replace logic board
Modem
Replace modem
Replace modem filter board
Replace logic board
AirPort 
Replace AirPort Card
Replace antenna card
Replace logic board
Bluetooth 
Replace Bluetooth card
Replace antenna card
Replace logic board
Audio IO (front line...

 Service Source
© 2005 Apple Computer, Inc. All rights reserved.
Upgrades
Power Mac G5 

Power Mac G5 Upgrades — Modem Upgrade Kit 195
Modem Upgrade Kit
Apple offers a modem board as a configure-to-order (CTO) option for the Power Mac G5 (Early 
2005) computer. For customers who purchase this computer in retail or want to add a modem 
board after purchase, Apple will provide an upgrade kit for Apple Authorized Service Providers. 
Installation of the upgrade kit must be performed by an Apple Authorized Service Provider. 
Damage resulting from installation by anyone other than a service...

Power Mac G5 Upgrades — Modem Upgrade Kit 196
Procedure
Note for Chinese Installations Only: The Chinese upgrade kit includes a China-specific label that 
you must apply to the modem. To attach the label, remove the protective backing and wrap the 
label around the modem as illustrated below.
Connect the modem filter cable to the connector on the end of the modem board. 
 
 
 
 
 
 
 
1. 

Power Mac G5 Upgrades — Modem Upgrade Kit 197
Connect the modem to the modem connector on the logic board and install the two 
mounting screws.  
With a small, flat-blade screwdriver, pry up and remove the modem plug on the computer’s 
back panel. 
2.
3.