Apple power mac g4 digital audio User Manual

							 Troubleshooting Symptom Charts/Startup -  4 3
System shuts down 
almost immediately 
after startup1 Power Macintosh G4 (PCI Graphics): Reset the Cuda chip. See 
Ò Resetting the Cuda ChipÓ in this chapter.
2 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. 
3 Check the modem connector (J27). If the connector has any 
bent pins, replace the logic board. 
4 Replace the processor module.
5 Replace the power supply.
6 Replace the logic board. 
						

							 Troubleshooting Symptom Charts/Startup -  4 4
System quits or stops 
responding 
intermittently1 If the system quits or stops responding in a specific 
application, replace the application. Mac OS X: Verify the 
application is compatible with OS X.
2 Clear parameter RAM. Hold down Command-Option-P-R 
during startup until you hear a second startup chime.
3 Perform a clean install of system software with the system 
restore CD that came with the computer.
4 Mac OS 9: Start up with extensions off to determine if there 
are system extension or control panel problems.
5 Mac OS X: Relaunch Finder.
6 Mac OS X: Run Disk Utility. Mac OS 9: Run Disk First Aid.
7 Run Apple Hardware Test in loop mode (Control-L) for an 
extended time to test the memory. 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.
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 processor module.
1 0 Replace the logic board. 
At startup, power-on 
LED and computer 
stay on only as long as 
button is held in; 
when button is 
released, LED goes off 
and computer powers 
down.Power Mac G4 (QuickSilver and QuickSilver 2002): 
1 Reseat the processor module.
2 Replace the processor module.
3 Replace the logic board.
4 Replace the power supply.
Power Mac G4 (Digital Audio):
5 Replace the power supply.
6 Reseat the processor module.
7 Replace the logic board.
8 Replace the processor module. 
						

							 Troubleshooting Symptom Charts/Error Tones -  4 5
Error Tones
Note: Error tones occur before system software loads.
Computer beeps once 
at startupOne beep means that no RAM is installed or detected.
1 If no DIMM is present, install a known-good DIMM in the top 
slot and try again. 
2 Reseat the DIMMs.
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.
4 Reseat the processor module.
5 Replace the processor module.
6 Replace the logic board. 
						

							 Troubleshooting Symptom Charts/Error Tones -  4 6
Computer beeps twice 
at startupTwo beeps means that incompatible RAM types may be installed. 
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).
1 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.
2 Reseat the processor module.
3 Replace the processor module.
4 Replace the logic board.
Computer beeps three 
times at startupThree beeps means that no RAM banks passed memory testing.
1 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.
2 Reseat the processor module.
3 Replace the processor module.
4 Replace the logic board. 
						

							 Troubleshooting Symptom Charts/Error Tones -  4 7
Computer beeps four 
or five times at 
startupFour or five beeps means that the ROM is probably bad and cannot 
be fixed. 
1 Replace the processor module.
2 Replace the logic board. 
						

							 Troubleshooting Symptom Charts/Video -  4 8
Video
Screen is black, but 
startup chime is 
present, drive 
operates, fan is 
running, and LED is 
lit1 Check video cable/card connections and connector pins.
2 Test with a known-good monitor. Replace the monitor, if 
necessary.
3 Remove all third-party devices.
4 Reseat the video card.
5 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.
6 Clear parameter RAM. Hold down Command-Option-P-R 
during startup until you hear a second startup chime.
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 video card.
1 0 Replace the logic board. 
						

							 
 Troubleshooting Symptom Charts/Video -  4 9
 
Screen is black, there 
is no startup chime, 
and drive does not 
operate, but fan is 
running and power 
LED is lit1 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.
2 Check all video cable/card connections and connector pins.
3 Power Macintosh G4 (PCI Graphics): Reset the Cuda chip. See  ÒResetting the Cuda ChipÓ in this chapter.
4 Reset the logic board: ¥ Power Mac G4 (all models except PCI 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. 
5 Reseat the video card.
6 Reseat the processor module.
7 Replace the processor module.
8 Replace the logic board. 
						

							 Troubleshooting Symptom Charts/Video -  5 0
Startup chime is 
present and screen 
lights up, but screen 
is gray1 Power Macintosh G4 (PCI Graphics): Reset the Cuda chip. See 
ÒResetting the Cuda ChipÓ in this chapter.
2 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. 
3 Reseat all PCI cards
4 Reseat all DIMMs.
5 Reseat the processor module.
6 Replace the processor module.
7 Replace the logic board.  
						

							 Troubleshooting Symptom Charts/Video -  5 1
Distorted Video 1Make sure that the video card driver and firmware are 
updated to the most recent versions.
2 Refer to the adjustments section of the service manual or 
ownerÕs manual for the monitor. Adjust monitor as 
necessary.
3 Third-party monitors: Try a known-good monitor.
4 Reseat the video cable.
5 Reseat the video card.
6 Check the video adapter, if present. Refer to ÒVGA-to-
Macintosh AdapterÓ earlier in this chapter.
7 Replace the video card. 
						

							 Troubleshooting Symptom Charts/Video -  5 2
Screen jitter 1Verify there are no environmental factors causing jitter.
2 Check all cable connections.
3 Make sure that the video card driver and firmware are 
updated to the most recent versions.
4 Test with a known-good monitor. Replace the monitor, if 
necessary. Refer to the appropriate monitor manual to 
troubleshoot a defective monitor.
5 Reseat the video card.
6 Replace the video card.
7 Replace the logic board.