Apple power mac g4 digital audio User Manual

							 Troubleshooting Symptom Charts/Sound -  5 3
Sound
No sound from 
computerÕs internal 
speaker1 Disconnect any microphones or external speakers.
2 Verify the volume is set appropriately in the Sound system 
preference or Sound control panel and mute is not checked. 
3 Mac OS 9: Start up with all third-party extensions off. 
Troubleshoot the extensions.
4 Clear parameter RAM. Hold down Command-Option-P-R 
during startup until you hear a second startup chime. 
5 Verify the speaker cable is plugged into the logic board.
6 Plug headphones or external speakers into the external jack. 
If the external jack works, replace the internal speaker. If 
the external jack doesnÕt work, replace the logic board. 
						

							 Troubleshooting Symptom Charts/Sound -  5 4
No sound from Apple 
Pro Speakers when 
attached to a Power 
Mac G4 (Digital 
Audio/QuickSilvers) 
computer1 Push on the Apple Pro Speaker jack to make sure it is firmly 
inserted into the Apple Speaker sound output port. (The Apple 
Pro Speaker jack has two detents. You should feel them as you 
push the jack into the sound output port. Giving the jack a 
slight twist while inserting it into the port may make a 
better connection.)
2 Verify the speaker volume and balance are set appropriately 
in the Sound system preference or Sound control panel and 
mute is not checked.
3 Clear parameter RAM. Hold down Command-Option-P-R 
during startup until you hear a second startup chime.
4 Reinstall system software.
5 Replace the Apple Pro Speakers. 
						

							 Troubleshooting Symptom Charts/Hard Drive -  5 5
Hard Drive
Single internal ATA 
hard drive does not 
spin; flashing 
question mark 
displays on screen1 Check all cable connections to the hard drive.
2 Try another power connector on the power cable harness. If 
the power cable is defective, replace the power supply.
3 Replace the hard drive. If the problem is resolved, make sure 
the driver and system software are updated to the most recent 
versions.
No internal SCSI 
drives show up on the 
desktop 1 Check that the drive shows up in Apple System Profiler. If it 
does, go to step 2. If it does not, go to step 5.
2 Update the drivers.
3 Verify there are no duplicate SCSI device addresses on a 
single SCSI bus. 
4 Disconnect external SCSI devices and check for proper 
termination. 
5 Reseat the SCSI PCI card and verify the data cable is seated 
firmly in the card and drives.
6 Check internal SCSI termination. Internal drives should not 
be terminated; the SCSI cable should have termination at the 
end.
7 If more than one SCSI device is on the SCSI chain, remove one 
device at a time and retest. Replace the bad drive.
8 Replace the internal SCSI data cable.
9 Replace the SCSI PCI card. 
1 0 Try another connector on the power cable harness. If there is 
a bad connector on the harness, replace the power supply.
No external SCSI 
drive shows up on 
desktop1 Verify there are no duplicate SCSI device addresses.
2 Verify the total cable length does not exceed the maximum 
total cable length for the SCSI card. See Knowledge Base 
article 58204.
3 Reseat the SCSI cable going to the SCSI card.
4 Replace the terminator on the external SCSI device.
5 Reseat the SCSI card.
6 Replace the SCSI card.
7 Replace the SCSI drive cables one at a time.
8 Disconnect the external SCSI chain. Using known-good cables, 
reattach devices one at a time. 
						

							 Troubleshooting Symptom Charts/ CD/DVD Drives -  5 6
CD/DVD Drives
CD/DVD drive tray 
wonÕt open 1 Reseat the drive data and power cables on the back of the CD/
DVD drive. 
2 Verify the CD/DVD drive bezel is properly seated. 
3 Reseat the drive data cable on the logic board. 
4 Try using a known-good disc.
5 Replace the CD/DVD drive.
CD/DVD drive icon 
does not appear on the 
desktop1 Check to see if the CD/DVD drive shows up in Apple System 
Profiler. If it does, go to step 2. If the drive does not show up 
in Apple System Profiler, go to step 7.
2 Try using a known-good disc.
3 If there is a disc stuck in the tray, eject it by restarting the 
computer while holding down the mouse button. Or eject the 
disc using the manual eject hole; refer to the userÕs manual. 
For Power Mac G4 (QuickSilvers), see Knowledge Base 
article 88215.
4 Turn off all third-party extensions.
5 Verify the firmware is the most recent version for that 
drive. Check Software Downloads for any current update.
6 Reinstall system software.
7 Reseat the drive data and power cables on the back of the CD/
DVD drive.
8 Try another connector on the power cable harness. If there is 
a bad connector on the harness, replace the power supply.
9 Replace the CD/DVD drive.
1 0 Replace the logic board only if other devices on the bus do not 
work. 
						

							 Troubleshooting Symptom Charts/Zip Drive -  5 7
Zip Drive
Zip drive does not 
show up on desktop1 Check that the Zip drive shows up in Apple System Profiler. 
If it does, go to step 2. If it does not, go to step 6.
2 Mac OS 9: Make sure the driver is turned on in Extensions 
Manager. 
3 Replace the Zip disk with a known-good disk.
4 Check that the Zip drive shows up in Apple System Profiler 
as ID = 1 (slave). If it does not, check the connector. There 
should be no jumper on the 6-pin device settingÕs connector.
5 Reinstall system software.
6 Reseat the drive data and power cables on the back of Zip 
drive.
7 Replace the Zip drive.
8 Replace the drive data cable.
9 Try another connector on the power cable harness. If there is 
a bad connector on the harness, replace the power supply. 
						

							 Troubleshooting Symptom Charts/Zip Drive -  5 8
Zip disk ejects 
immediately after 
being inserted1 Replace the Zip disk with a known-good disk.
2 Reseat the drive data and power cables on the back of the Zip 
drive. 
3 Check that the Zip drive shows up in Apple System Profiler 
as ID = 1 (slave). If it does not, check the connector. There 
should be no jumper on the 6-pin device settingÕs connector.
4 Reinstall system software.
5 Replace the drive data cable.
6 Replace the Zip drive.
Zip disk does not eject 1 Use the manual eject hole on the Zip drive to eject the stuck 
disk. Examine the disk for damage. Restart the computer, and 
hold down the manual eject button throughout the entire 
startup process. Once the system has started up, insert a 
known-good Zip disk and try ejecting it by dragging the disk 
icon to the trash can.
2 Reseat the Zip drive bezel so the bezel slot aligns correctly.
3 Reinstall system software.
4 Replace the Zip drive.
5 Replace the drive data cable. 
Zip drive runs 
continuously1 Replace the Zip disk with a known-good disk.
2 Replace the Zip drive.
3 Replace the drive data cable. 
						

							 Troubleshooting Symptom Charts/USB Devices -  5 9
USB Devices                                                                                    
At startup, cursor 
does not move with the 
Apple mouse1 Verify that mouse and keyboard connections are secure.
2 Mechanical mouse: Inspect the inside of the mouse for buildup 
of dirt or other contaminants. Clean the mouse if necessary. 
See Knowledge Base article 6491.
3 If the mouse is connected to the keyboard, connect the mouse 
to one of the USB ports on the I/O panel instead. If the mouse 
works, replace the keyboard. 
4 Replace the mouse.
5 If the mouse is connected to one of the USB ports on the I/O 
panel, switch to the other USB port. If the mouse operates 
correctly, the first port was bad. Replace the logic board. 
Note: You can also use Apple System Profiler to verify USB 
ports. 
						

							 Troubleshooting Symptom Charts/USB Devices -  6 0
No response to any 
key on keyboard1 Verify that keyboard and mouse connections are secure.
2 Remove all USB devices, except the keyboard and mouse. If 
the keyboard operates correctly, troubleshoot the other USB 
devices.
3 Switch the keyboard to a different USB port. If the keyboard 
operates correctly, the first port was bad. Replace the logic 
board. 
Note: You can also use Apple System Profiler to verify 
USB ports.
4 Mac OS 9: Start up with extensions off. If the problem is 
resolved, troubleshoot the extensions.
5 Mac OS X: Relaunch Finder.
6 Start up from the system installation CD or system restore 
CD that came with the computer. If the keyboard operates, 
reinstall system software.
7 Replace the keyboard.
8 Replace the logic board.  
						

							 Troubleshooting Symptom Charts/USB Devices -  6 1
USB printer does not 
operate1 Verify that connections to the printer and computer are 
secure.
2 Switch the printer to a different USB port. If the printer 
operates correctly, the first port was bad. Replace the logic 
board. 
Note: You can also use Apple System Profiler to verify 
USB ports.
3 Verify the correct versions of the system software and 
printer driver are installed.
4 Mac OS X: Use Print Center to verify that you have the 
correct printer selected. Mac OS 9: Use Chooser to verify that 
you have the correct printer selected.
5 If the printer is connected to a third-party USB hub, switch 
it to one of the USB ports on the I/O panel. If the printer 
operates, the hub is bad.
6 Mac OS 9: Turn off unnecessary extensions.
7 De-install and then re-install the print driver.
8 Replace the printer interface cable.
9 Replace the printer.
1 0 Replace the logic board. 
						

							 Troubleshooting Symptom Charts/FireWire Devices -  6 2
FireWire Devices
No external FireWire 
device icon appears on 
the desktop1 Verify that the FireWire device is turned on and the FireWire 
cable is securely connected to the device and the computer.
2 If the device requires external power, make sure it is plugged 
in.
3 Check that the FireWire device is listed in Apple System 
Profiler. If it is, go to step 4. If it is not, go to step 5.
4 Check the FireWire device documentation to see if additional 
drivers are required. If so, make sure the drivers are 
installed.
5 Check for broken pins, dust, dirt, or wear on both FireWire 
cable connectors, the device FireWire port, and the computer 
FireWire port. 
6 Reconnect the FireWire device to another FireWire port on 
the computer. If the computer has a bad FireWire port, 
replace the logic board.
7 Replace the FireWire cable.
8 Replace the FireWire device.
9 Replace the logic board.