Apple power mac g5 late 2005 User Manual

Power Mac G5 (Late 2005) Take Apart — Power Supply 131
Replacement Note: To fit the power supply back into the enclosure, align the power supply so 
that it is parallel to the bottom panel and push the power supply straight back until the bus bar 
tabs snap into place. Then slide the power supply toward the back of the computer, making sure 
the power receptacle aligns with the opening in the back panel.
Note: Make sure the power supply cables do not catch on the enclosure or under the power 
supply....

Power Mac G5 (Late 2005) Take Apart — Air Deflector Sensor Board 132
Air Deflector Sensor Board
Tools
The only tool required for this procedure is a flatblade screwdriver. A small mirror to use in 
locating the board is optional.
Preliminary Steps
Before you begin, open the computer, lay it on its side with the access side facing up, and remove 
the following:
Front inlet fan assembly
Heatsink cover
Processor inlet frame (Dual 2.0/2.3 GHz) or Processor inlet frame (Quad)
Processor (Dual 2.0/2.3 GHz) or...

Power Mac G5 (Late 2005) Take Apart — Air Deflector Sensor Board 133
Part Location 

Power Mac G5 (Late 2005) Take Apart — Air Deflector Sensor Board 134
Procedure
Locate the air deflector sensor board inside the enclosure on the bottom right front corner 
of the frame. You may find a small mirror useful in seeing the board.
Disconnect the sensor cable from the air deflector sensor board.
Pry up the sensor board from the frame and remove the board from the enclosure. 
Note: Adhesive on the back of the board attaches the sensor board to the frame.
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 Service Source
© 2005 Apple Computer, Inc. All rights reserved.
Troubleshooting
Power Mac G5 (Late 2005) 

Power Mac G5 (Late 2005) Troubleshooting — General Information 13
General Information
DDR2 Memory
The Power Mac G5 (Late 2005) has eight DIMM slots for PC2 4200, 533 MHz, Double-Data-Rate 
2 (DDR2) SDRAM DIMMs. The slots are arranged in two banks of four slots each. Power Mac G5 
(Late 2005) computers come with a minimum of 512 MB of RAM, installed as a pair of 256 MB 
DIMMs in the two center slots. Additional DIMMs can be installed in the open DIMM slots, as 
illustrated below. 
Note: DIMMs must...

Power Mac G5 (Late 2005) Troubleshooting — General Information 13
In the Power Mac G5 (Late 2005), DIMMs must fit the following specifications. Memory from older 
Macintosh computers is not compatible.
PC2 4200, 533 MHz, DDR2 DIMMs
240-pin module
Maximum number of memory devices on DDR2 SDRAM: 18
Nonparity
Unbuffered (registered or buffered DDR2 SDRAM cannot be used)
Either error-correcting code (ECC) or no error-correcting code (NECC) modules  
Note: Do not mix ECC and NECC memory modules within a...

Power Mac G5 (Late 2005) Troubleshooting — General Information 13
Important: Combined maximum power consumption for all four expansion slots should not 
exceed 200 W. Combined maximum video RAM for all graphics cards is 1 GB.
While all slots can accommodate PCI Express cards that have up to 16-lanes, if you install a card 
that requires a greater bandwidth than the slot provides, the card will operate at the bandwidth 
of the slot. For example, an 8x card installed in a 4x slot will operate as a 4x...

Power Mac G5 (Late 2005) Troubleshooting — General Information 13
Press the reset button on the logic board. 
Note: For the location of the reset button, see “Logic Board Diagram” in the Views chapter.
Replace the front inlet assembly and close the computer.
Turn on the computer.
Power-On Self Test: RAM and Processor Verification
A power-on self test in the computer’s ROM automatically runs whenever the computer is started 
up after being fully shut down (the test does not run if the computer is...

Power Mac G5 (Late 2005) Troubleshooting — General Information 140
Diagnostic LED Table
LED DescriptionColor When OnExpected ConditionLED “On” IndicatesThings to CheckNext Steps
No 1CPU ARedOffCPU A improperly installed
Is processor assembly seated properly? Check that mounting screws are properly tightened.
Remove processor assembly and check for damaged pins on processor connector or logic board connector. Replace processor, if necessary. Replace logic board, if necessary.
No 2Overtemp LEDRedOffCPU...