Apple power mac g4 digital audio User Manual

							 
 TroubleshootingGeneral/SDRAM DIMMs -  3 3 
Power Mac G4 (all models except PCI Graphics) 
Four slots on the Power Mac G4 (AGP Graphics/Gigabit Ethernet) 
logic boards accept 64, 128, 256, or 512 MB DIMMs. Three slots 
on the Power Mac G4 (Digital Audio/QuickSilver/QuickSilver 
2002) board accept 64, 128, 256, or 512 MB DIMMs. Any 256 
MB DIMMs must be 128 or 256 Mbit technology; 512 MB DIMMs 
must be 256 Mbit technology. 
Power Macintosh G4 (PCI Graphics) 
Four slots on the Power Macintosh G4 (PCI Graphics) logic board 
accept 8, 16, 32, 64, 128, and 256 MB DIMMs. Any 128 MB 
DIMMs must be 64 or 128 Mbit technology; 256 MB DIMMs must 
be 128 Mbit technology. 
						

							 
 TroubleshootingGeneral/ PCI Cards -  3 4 
PCI Cards 
Video Card Installation 
Power Mac G4 computers require an I/O video card that moves 
video from the main logic board. The card is installed in slot #1 on 
the logic board, as illustrated below. Slot #1 on the Power 
Macintosh G4 (PCI Graphics) is a PCI slot; slot #1 on the other 
models of Power Mac G4 is an AGP slot. Refer to the Symptom 
Charts for details on troubleshooting video cards. 
						

							 
 TroubleshootingGeneral/ PCI Cards -  3 5 
Power Mac G4 (QuickSilvers/Digital Audio)
Power Mac G4 (PCI Graphics/AGP Graphics/Gigabit Ethernet)
Slots #2-5Slot #1
Slot #1Slots #4  #3  #2 
						

							 
 TroubleshootingGeneral/ PCI Cards -  3 6 
Cleaning Procedure for Card Connectors 
It is possible for residue to build up on the gold edge connector 
pins on some cards, which could cause a variety of symptoms. 
If you are having problems with a card, inspect the connector pins 
with a magnifying glass. If you find residue, use a pencil eraser or 
the chemical cleaner ÒstabilantÓ (see TIL article 10468) to 
gently clean the pins. Remember, never handle the cards by the 
gold connectors. 
						

							 
 TroubleshootingGeneral/VGA-to-Macintosh Adapters -  3 7 
VGA-to-Macintosh Adapters 
To avoid ÒNo videoÓ or ÒBlack screenÓ situations, do not use two 
VGA-to-Macintosh adapters (one on each end) on the video cable 
that connects a Power Mac G4 computer to a monitor with a 
captive VGA connector.
If you need to connect a VGA monitor, connect it in one of the 
following ways:
¥ VGA monitor --> to a VGA cable with VGA connectors on both 
ends --> to the video card on the Power Mac G4
¥ VGA monitor --> to a mixed cable, a cable that has a VGA 
connector on one end and a Macintosh connector on the other end 
--> to the video card on the Power Mac G4 
Cable Select Drives in QuickSilver 2002ED 
The education-only version of the Power Mac G4 (QuickSilver 
2002ED) works with ATA and ATAPI internal storage devices that 
are set for cable select mode. The cable select feature forces the 
device to set its ID as either master or slave based upon its 
position on the ATA/ATAPI cable. If the device is attached to the end 
of the cable, then the device identifies itself as a master. If the 
device is at the middle cable position, then it is a slave. Because 
cable select mode forces the drive to set its ID based upon its 
position on the cable, hard drives and optical drives are easily 
configured. Before you install an additional third-party ATA and 
ATAPI drive, check the documentation that came with the drive or 
with the manufacturer to make sure it is set for cable select mode. 
Important: 
 Use the original Apple cables that came with this 
computer when you install additional drives. Some non-Apple 
cables may not correctly support cable select mode. 
						

							 
 Troubleshooting Symptom Charts/How to Use the Symptom Charts  -   3 8 
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 you have replaced a module, 
reinstall the original module before you proceed to the next cure.
In addition, refer to the Diagnostics page of Service Source at 
Service Source Online (http://service.info.apple.com) for 
information on diagnostic tools that can help you isolate hardware 
problems. 
For other assistance, contact Apple Technical Support. 
						

							 
 Troubleshooting Symptom Charts/Startup -  3 9 
Startup 
System is completely 
dead (no fan 
movement and power-
on button is not lit)1 Verify the power outlet is good. 
2 Replace the power cord. 
3 Make sure the voltage switch on the back of the power supply 
is set to the correct voltage.
4 Check for trickle voltage on the power supply connector. 
Refer to ÒPower Supply VerificationÓ in this chapter. If 
verification fails, replace the power supply.
5 Disconnect external devices, including the monitor, and start 
up the computer.
6 Remove internal cards and start up the computer.
7 Disconnect internal hard drives from the logic board and 
start up the computer.
8 Check the modem connector (J27). If the connector has any 
bent pins, replace the logic board.
9 Replace the logic board. 
						

							 
 Troubleshooting Symptom Charts/Startup -  4 0 
Memory error 
message appears on 
the screen1 Reseat the DIMMs. 
2 Verify that only SDRAM DIMMs are installed. Use PC-100 
DIMMs on Power Mac G4 (PCI/AGP/Gigabit Ethernet) and 
PC-133 DIMMs on Power Mac G4 (Digital Audio/
QuickSilvers).
3 Run Apple Hardware Test. If the test finds bad memory, 
replace the DIMMs one at a time and test until all bad DIMMs 
are replaced with known-good modules.
Flashing question 
mark appears on the 
screen1 Start up from the system restore CD and check to see if the 
hard drive shows up on the desktop. If it does, go to step 2. If 
it does not, go to step 4.
2 Mac OS X: Run Disk Utility. Mac OS 9: Run Disk First Aid. 
Update the driver and restart the computer.
3 Reinstall system software using the system restore CD that 
came with the computer.
4 Reseat the hard drive data and power cables.
5 Replace the hard drive. 
						

							 
 Troubleshooting Symptom Charts/Startup -  4 1
Computer begins to 
power up, the fan and 
hard drive are 
spinning, the power 
LED is lit, but there 
is no startup chime or 
video1 Reset the logic board.
¥ Power Mac G4 (AGP Graphics): Refer to ÒResetting the 
PMU on the Logic BoardÓ in this chapter.
¥ Power Macintosh G4 (PCI Graphics): Refer to ÒResetting 
the PCI Logic BoardÓ in this chapter. 
2 Power Macintosh G4 (PCI Graphics): Check the jumper block 
at J25. Make sure the jumper is the correct color for the 
processor type, includes all required inner metal clips, and 
is installed in the correct direction. See ÒProcessor ModuleÓ 
in Take Apart for more information.
3 Reseat the processor module.
4 Verify all PCI and AGP cards are seated properly.
5 Replace the processor module.
6 Replace the logic board. 
						

							 Troubleshooting Symptom Charts/Startup -  4 2
System shuts down 
intermittently1 Make sure the power cord is plugged in firmly.
2 Check that the power source is turned on and the correct 
voltage is present.
3 Replace the power cord.
4 Make sure the air vents are clear. 
5 Check that the fan cable is connected and the fan is 
operational. 
6 Check that the heatsink is properly attached to the processor.
7 Power Macintosh G4 (PCI Graphics): Reset the Cuda chip. See 
ÒResetting the Cuda ChipÓ in this chapter.
8 Reset the logic board:
¥ Power Mac G4 (AGP Graphics): Refer to ÒResetting the 
PMU on the Logic BoardÓ in this chapter.
¥ Power Macintosh G4 (PCI Graphics): Refer to ÒResetting 
the PCI Logic BoardÓ in this chapter. 
9 Replace the power supply.
1 0 Replace the logic board.