Apple power mac g4 cube User Manual

							 
Power Mac G4 Cube Troubleshooting -   
9  
 Symptom Charts 
Flashing question mark appears on the desktop 
 
1. Start up the computer from the Software Restore disc to verify that the hard disk icon 
can be seen on the desktop. 
2. If the disk icon is visible on the desktop, follow these steps:
¥ Update the driver with Drive Setup. 
¥ Check the disk with Disk First Aid. 
¥ Check for Mac OS software on the startup disk. Remove extra System Folders. 
¥ Perform a clean installation of the Mac OS using the Software Restore disc. 
¥ Back up all the data, and reinitialize the disk.
3.  If the drive icon is not visible on the desktop, follow these steps:
¥ Reset Parameter RAM by holding down Command-Option-P-R when you turn on 
the computer. 
¥ Ensure all cable connections to the hard drive and the logic board are secure. 
¥ Contact Apple to schedule a service repair.
¥ If the drive is not spinning, check to make sure the proper voltages are getting to 
the drive power cable.
4. Remove the enclosure, and locate connector J2 on the DC-to-DC board. 
5. Plug only the power adapter into the computer and turn it on. 
6. Measure the voltages as shown in Figure 1. Pin 1 should measure approximately 5 V; 
pin 4 should measure approximately 12 V. (Pins 2 and 3 are ground.)
¥  If the voltmeter doesnt show the proper voltages, replace the DC-to-DC board. 
¥  If the voltmeter shows the proper voltages, go to the next step. 
						

							 
10 -  
Power Mac G4 Cube Troubleshooting
 Symptom Charts 7. Replace the hard drive. If symptom is resolved, update the ATA device driver and 
install the Mac OS on the replacement drive. 
8. If the symptom is not resolved, test the hard drive in a known-good computer. If the 
hard drive works in a known-good computer, contact Apple to schedule a service 
repair.  
Power
 
Power button lights up when touched, but goes out as soon as you remove 
your Þnger, and the computer does not turn on
 
During shipping the DC-to-DC board in the computer may move slightly out of its 
connector. Reseat the DC-to-DC board in its connector. 
Power button light ßashes in sequence
 
Refer to the section earlier in this chapter ROM and Processor VeriÞcation: Power-On 
Self Test. 
Computer is on, but randomly turns off or goes to sleep; computer is off, but 
randomly turns on or wakes up
 
1. Make sure the computer is on a sturdy, ßat surface. 
2. Make sure there is nothing on top of the computer. 
3. Check the settings in the Energy Saver control panel. The computer may be in sleep 
mode according to these settings.
4. Verify the power adapter is plugged securely into the computer.
5. Verify the power cord is plugged securely into the wall socket and the power adapter.
6. Remove and reinstall the DC-to-DC board.
7. Check the year and work week code in the serial number on the bottom of the 
computer. The serial number follows this format: PP 
YWW  
xxxxxx  
¥ If the serial number shows a year and work week code of 035or earlier (for 
example SG 
035 
MW6JDZ), go to the next step.
¥ If the serial number shows a year and work week code between 036 and 039 (for 
example SG 
036 
MW6JDZÑSG 
039  
MW6JDZ), replace the power button gasket that   
P P Plant or vendor designator 
Y Year code (0 = year 2000)
W W Work week of manufacture 
xxxxxxUnique base number and configuration 
						

							 
Power Mac G4 Cube Troubleshooting -   
11  
 Symptom Chartsis a customer-installable part in the CIP program.
¥ If the serial number shows a year and work week code of 040 or later (for example 
SG 
040 
MW6JDZ), go to the next step.
8. Remove the top plate assembly and check the proximity switch plate that is secured to 
the power button board on the underside of the top plate. If the plate on the board has 
a notch or if tape is secured under the proximity switch plate, go to the last step. 
Otherwise, go to the next step.
9. Remove the two Torx screws that secure the proximity switch plate to the board and 
top plate assembly.
Run a strip of Kapton tape (32 mm by 3 mm) near the rounded edge of the power 
button board.
Install the proximity switch plate and press it against the flat edge of the board.
Install the two screws half way in. Then maintain light pressure on the plate so it 
stays level end-to-end as you tighten the screws.
10. Check the underside of the top plate assembly for the EMI gasket.
If the top plate assembly is marked with part number 805-2807, either replace the top 
plate or replace the EMI gasket. 
						

							 
12 -  
Power Mac G4 Cube Troubleshooting
 Symptom Charts 
Sound
 
No sound from speakers and unresponsive USB peripherals
 
The speakers that come with the Power Mac G4 Cube computer may suddenly go silent if 
an Apple Studio Display LCD (ADC) or an Apple Cinema Display (ADC) is connected and 
music is playing with the volume set to maximum. Additionally, USB devices (such as the 
keyboard and mouse) stop responding if they are attached to the monitors USB 
connector. 
1. Connect the speakers directly to the computer instead of the monitor.
2. Restart the computer and lower the volume. If the mouse is responsive, you can 
choose Restart from the Special menu. If the mouse is unresponsive, you can force a 
restart by pressing the reset button on the bottom of the Power Mac G4 Cube 
computer. 
Video
 
A monitor with an Apple Display Connector displays no video when 
connected to a Power Mac G4 Cube computer; however, if you connect a 
monitor with a VGA-style connector video appears on the display 
 
1. Connect a known-good monitor with an Apple Display Connector (ADC). 
2. Verify the monitor with an ADC has a known-good power source. 
3. Make sure the display cable from the monitor is securely connected to the video card. 
4. Make sure the video riser card and the video card are properly seated in their 
connectors. 
5. Verify the cable connector at J3 on the video riser card is pushed in all the way. This 
connector provides the voltage for the ADC. 
						

							 
Power Mac G4 Cube Troubleshooting -   
13  
 Symptom Charts 
Memory
 
Error message about memory appears on the screen
 
1. Reseat SDRAM DIMMs. 
2. Verify that only compatible PC-100 SDRAM DIMMs are installed. 
3. Run Apple Hardware Test to locate the bad SDRAM DIMM. 
4. If a bad DIMM is detected, replace it with one that is known-good.
Related articles:
¥ 42671 Power Mac G4 Cube: Must Use 35 mm RAM DIMMs
¥ 58684 Power Mac G4 Cube: Installing or Replacing Memory 
Modem
 
Dialup software does not initiate a connection 
 
1. The dialup software might be installed incorrectly. Make sure software is fully installed 
and all required extensions are enabled. 
2. If necessary, reinstall the dialup software and provide the necessary information for 
setup. 
3. Open the Modem Country Selector utility and make sure modem is set to the correct 
country. 
Modem drops its connection
 
1. If the disconnect always happens after a speciÞc interval of time or after a period of 
network inactivity, it could be caused by timed disconnects. Check the disconnect if 
idle setting in the Remote Access control panel and check idle timeout policy of the 
Internet service provider (ISP). Contact ISP or network administrator for more 
information. 
2. Check both ends of phone cable for damage. Secure phone cable at both ends. 
3. Try another cable and phone jack. Use direct modem-to-outlet connection. 
4. ConÞgure the Modem control panel to use the appropriate modem script. 
5. Avoid phone line splitters, cable extenders, faulty or overly long phone cables. 
6. The phone line may be too noisy to handle the higher modem speeds. Try connecting 
at a slower speed or use a generic CCL Þle. (If you are familiar with the CCL script 
language, you can edit the modem script to force a connection at a lower speed.) If the 
symptom continues, contact the phone company to report the bad phone line. 
7. Verify if the user has Call Waiting on that phone line. With Call Waiting active, an 
incoming call can interrupt the connection. Disable Call Waiting using AT commands 
placed in the init string of the dialup application. (Usually the string is *70.)  
						

							 
14 -  
Power Mac G4 Cube Troubleshooting
 Symptom Charts 8. There may be an issue with the server to which you are connecting. Servers 
sometimes develop conditions that disconnect users without explanation. Try calling 
back later or use an alternate number if one is available. 
9. Check with the ISP. 
10. Reseat the modem board. If the problem persists, replace the modem board. 
11. Open the Modem Country Selector utility and make sure modem is set to the correct 
country. 
An alert appears as the modem dials out 
 
1. Make sure the correct CCL and the correct driver are installed. If necessary, reinstall 
the driver and CCL. 
2. Try known-good phone cable and phone outlet. Avoid overly long phone cables. 
3. Try connecting to a direct phone line. Avoid switchboards. 
4. Connect directly to phone socket. Disconnect extension cables and telephone line 
splitters. 
5. Test phone socket with normal phone or external modem. If alert appears, contact the 
phone company to report the issue. 
6. If symptom persists, reinstall Mac OS and modem software. 
7. Replace the modem board. 
8. Open the Modem Country Selector utility and make sure modem is set to the correct 
country. 
Modem not connecting to online site 
 
1. The phone line may have too much noise. If the user has a second line, try that one. 
The user should contact their local phone company and request their line be checked. 
2. Check to make sure the TCP/IP control panel is correctly conÞgured for the users 
internet service provider. If the TCP/IP control panel is not conÞgured correctly, it may 
connect but wont be able to access any sites. 
3. Sometimes online services use different servers for dial-up/authentication and for 
services. If one server is down, users may be able to log on but not access any 
services. Contact the online service for help. 
4. Open the Modem Country Selector utility and make sure modem is set to the correct 
country. 
						

							 
Power Mac G4 Cube Troubleshooting -  
15  
 Symptom Charts 
Modem is slow responding
 
1. Too many people are using the Internet service providers (ISP) Internet services. 
When using an ISP, users need to remember that the ISP only has a limited amount of 
access to the Internet. If a large number of people are dialing in, individuals speeds 
will be affected.
2. Check with the ISP, they might have a reduced capacity due to repair, for example. 
3. Check the phone line. The quality of the phone line can limit modem performance.  
Computer does not respond when modem dials
 
1. Extensions can be in conßict or the Mac OS can be damaged. Restart with only Mac 
OS All and any modem drivers needed. If the issue is solved, troubleshoot extensions. 
2. If the problem persists, perform a clean installation of Mac OS 9. 
3. Check phone cable and reseat modem board. 
4. Replace the modem board. 
5. Open the Modem Country Selector utility and make sure modem is set to the correct 
country. 
Modem is not recognized or does not respond 
 
1. Make sure the correct CCL and extension Þles are installed and the correct CCL is 
selected. Delete the modem preference and reinstall the CCL and modem extension. 
2. Check the modem with Apple Hardware Test. 
3. Reseat the modem board and modem cable. 
4. Reset parameter RAM by holding down Command-Option-P-R when the computer is 
turned on. 
5. Disconnect all third-party equipment and use the Extensions Manager control panel to 
start up the computer with the Mac OS All 9.x extensions set. If OK, troubleshoot 
extensions and check for hardware compatibility. 
6.  If the symptom persists, perform a clean installation of the Mac OS and try again. 
7. Test the modem board in a known-good computer. 
8. Replace the modem board.  
						

							 
16 -  
Power Mac G4 Cube Troubleshooting
 Symptom Charts 
DVD Player
 
When Apple DVD Player is opened, an alert box appears with this message: 
Apple DVD Player can not open because the required hardware was not 
found 
 
1. Quit all open applications and reopen Apple DVD Player. 
2. Restart the computer and reopen Apple DVD Player. 
3. Using Extensions Manager, select Mac OS 9.x All and restart. 
4.  If the symptom persists, perform a clean installation of the Mac OS and try again. 
5. Ensure all the connections to the DVD-ROM drive are secure. (Apple DVD Player 
cannot open if a DVD-ROM drive is not present.) 
6. If all software troubleshooting has not resolved the issue, try replacing the DVD-ROM 
drive. 
Related articles:
¥ 58383: Apple DVD Player: Troubleshooting Video Issues
¥ 25000: Apple DVD Player: Disc May Be Dirty or Scratched Error Message 
USB Devices
 
No response when keys are pressed on the keyboard
 
1. Make sure the keyboard is connected to a USB port.
2. Remove all USB devices, except the keyboard and mouse.
3. Start up the computer with extensions off. If the issue is resolved, troubleshoot 
extensions.
4. Start up the computer from the Software Restore disc that came with the computer 
and test. Reinstall system software.
5. Replace the keyboard. 
At system startup time, the pointer does not move with the Apple Pro Mouse
 
1. Disconnect and reconnect the mouse securely to the keyboard.
2. If the mouse is connected to keyboard, connect the mouse to one of the USB ports on 
the computer instead. If the mouse works, replace the keyboard.
3. Start up from the Software Restore disc or use the Extensions Manager control panel 
to start up the computer with the Mac OS All 9.x extensions set. If OK, troubleshoot 
extensions. If the pointer doesnt move, replace the mouse. 
						

							 
Power Mac G4 Cube Troubleshooting -  
17  
 Symptom Charts4. Disconnect all third-party USB devices. If the symptom is resolved, the mouse is OK 
and the issue is with one of the third-party USB devices. Reconnect each USB device 
until the issue reappears. Refer to the third-party USB company for compatibility 
information. 
The pointer moves, but clicking the mouse has no effect
 
1. Start up from the Software Restore disc that came with the computer. If OK, 
troubleshoot extensions or reinstall system software. 
2. Reset Parameter RAM by holding down Command-Option-P-R at when you turn on 
the computer. 
3. If the mouse is connected to the keyboard, connect the mouse to one of the USB ports 
on the computer instead. If the mouse works, replace the keyboard. 
4. Disconnect all third-party USB devices. If the symptom is resolved, the mouse is OK 
and the issue is with one of the third-party USB devices. Reconnect each USB device 
until the symptom reappears. Refer to the third-party USB company for compatibility 
information. 
5. If the mouse is connected to one of the USB ports on the computer, try the other USB 
port.
6. Replace the mouse. 
						

							 
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