Press the PMU reset switch S1 once on the logic board and then proceed to step 3. WAIT ten seconds before connecting the power cord and powering the computer on. If the computer powers on, go to the next step. Run Apple Hardware Test and return the computer to the customer. Be sure to reset the computer's time, date, and other system parameter settings before returning the computer to the customer. It indicates that there is power to the board and does not imply a fault condition. Note that when you replace the logic board on a Power Macintosh G4 PCI Graphics , you must also change the processor jumper block and warranty sticker to be compatible with the processor module.
Failure to install the jumper block properly will result in a unit that does not boot up. Many system problems can be resolved by resetting the Cuda chip see the Symptom Charts for examples. Press the Cuda reset button on the logic board to reset the Cuda chip. The Cuda reset button is located on the logic board to the right of the battery.
Refer to the Logic Board Diagram earlier in this chapter for location information. Whenever you have a Power Macintosh G4 PCI Graphics computer that fails to power up, you should follow this procedure before replacing any modules. Unplug the computer. Press the Power On button on the front of the unit. Remove the battery from the logic board. Wait at least 10 minutes before replacing the battery. Reassemble the computer and test the unit. A graphic follows showing their location. After that, it is unlikely it will illuminate again in a trouble-free system.
If this light stays on for a prolonged period, this is a sign of trouble on the ATA bus. Since the downstream power is controlled individually for each port, it is possible to have these LEDs in a different state: one off and one on. These LEDs are not immediately illuminated at the beginning of a restart or cold power-on.
Then DS4 and DS5 on for a second or two 3.
Then off very briefly 1 second 4. Then back on confirms secondary PCI bus is initialized and power now available These two LEDs are often useful when troubleshooting an unpredictable system. If one LED is on and the other is off, there is a problem. As a result, you may need to watch this LED much more carefully than the others to tell if there is activity.
If this LED is ever on continuously and bright, then the system is troubled and likely hung. If the system fails to start up, follow the procedure outlined below to determine whether the problem is related to the power supply. Note: To verify the power supply, you need a volt meter. Verification Procedure Follow the procedures in the Take Apart chapter to access the power supply.
Important: For this verification procedure when connecting the volt meter leads to specific pins, ensure the power supply cable remains securely plugged into the power supply connector on the logic board. Plug in a known-good power cord into the back of the com- puter. Do not turn on the computer. Connect the red lead of the volt meter to pin 9 of the power supply connector.
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If voltage is still not present, replace the power supply; otherwise, go to the step 4. Go to the next step for further verification. Connect the red lead of the volt meter to pin 22 of the power supply connector. If voltage is still not present, replace the power supply; otherwise, go to the next step. Start up the computer by pressing the power button on the front of the computer. Note: Verify that the power cable is plugged into connector J If the computer starts up normally, the power supply is OK.
If the computer does not start up, go to the next step. Check to see if the power supply fan is spinning. If it is not, go to the next step. Connect the red lead of the volt meter to pin 1 of the power supply connector. Connect the red lead of the volt meter to pin 4 of the power supply connector. Measure the voltage of pin 10 on the power supply connector. The testing is complete. You have just verified that the power supply is not the cause of the "No apparent power" symptom. The card is installed in slot 1 on the logic board, as illustrated below. Refer to the Symptom Charts for details on troubleshooting video cards.
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 "stabilant" see TIL article to gently clean the pins. Remember, never handle the cards by the gold connectors. 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.
For other assistance, contact Apple Technical Support. Refer to "Power Supply Verification" in this chapter. If verification fails, replace the power supply. If the connector has any bent pins, replace the logic board. Run Apple Hardware Test. Flashing question mark appears on the screen 4 5 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. Update the driver and restart the computer.
Reinstall system software using the system restore CD that came with the computer. Reseat the hard drive data and power cables. Replace the hard drive. 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 "Processor Module" in Take Apart for more information. Reseat the processor module. Replace the processor module. Replace the logic board. See "Resetting the Cuda Chip" in this chapter.
See " Resetting the Cuda Chip" in this chapter. Check the modem connector J Replace the power supply. Hold down Command-Option-P-R during startup until you hear a second startup chime. 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.
Computer beeps three times at startup Three beeps means that no RAM banks passed memory testing. Replace the monitor, if necessary. Adjust monitor as necessary. Check all cable connections. Make sure that the video card driver and firmware are updated to the most recent versions. Test with a known-good monitor. Refer to the appropriate monitor manual to troubleshoot a defective monitor. Reseat the video card. Replace the video card. Troubleshoot the extensions.
If the external jack works, replace the internal speaker. If the external jack doesn't work, replace the logic board. The Apple Pro Speaker jack has two detents.
Power Mac G4 Quicksilver Repair Manual : Free Download, Borrow, and Streaming : Internet Archive
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. Verify the speaker volume and balance are set appropriately in the Sound system preference or Sound control panel and mute is not checked. Clear parameter RAM. Reinstall system software. Replace the Apple Pro Speakers. If the power cable is defective, replace the power supply.
If the problem is resolved, make sure the driver and system software are updated to the most recent versions.
Index of /Manuals/AppleComputer
If it does not, go to step 5. Internal drives should not be terminated; the SCSI cable should have termination at the end. Replace the bad drive. If there is a bad connector on the harness, replace the power supply. Verify the total cable length does not exceed the maximum total cable length for the SCSI card.
See Knowledge Base article Replace the terminator on the external SCSI device. Reseat the SCSI card. Replace the SCSI card. Replace the SCSI drive cables one at a time. Disconnect the external SCSI chain. Using known-good cables, reattach devices one at a time. If the drive does not show up in Apple System Profiler, go to step 7. Or eject the disc using the manual eject hole; refer to the user's manual. Check Software Downloads for any current update.
If it does not, go to step 6. If it does not, check the connector. There should be no jumper on the 6-pin device setting's connector. 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.
Help! PowerMac G4 does not start!
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. Zip drive runs continuously 1 2 3 Replace the Zip disk with a known-good disk. Replace the Zip drive. Replace the drive data cable. Clean the mouse if necessary. If the mouse works, replace the keyboard. If the mouse operates correctly, the first port was bad. Remove all USB devices, except the keyboard and mouse. If the keyboard operates correctly, troubleshoot the other USB devices.
Switch the keyboard to a different USB port. If the keyboard operates correctly, the first port was bad. Mac OS 9: Start up with extensions off. If the problem is resolved, troubleshoot the extensions. Start up from the system installation CD or system restore CD that came with the computer. If the keyboard operates, reinstall system software.
Replace the keyboard. Switch the printer to a different USB port. If the printer operates correctly, the first port was bad. Verify the correct versions of the system software and printer driver are installed. Mac OS 9: Use Chooser to verify that you have the correct printer selected.
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If the printer operates, the hub is bad. Mac OS 9: Turn off unnecessary extensions. De-install and then re-install the print driver. Replace the printer interface cable. Replace the printer. If the device requires external power, make sure it is plugged in. The PCI variant was discontinued at the end of It was also the first personal computer to include gigabit Ethernet as standard.
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Zip drives were optional on all models. These models also introduced Apple's proprietary Apple Display Connector video port. A new line with a revamped motherboard but the familiar "Graphite" case debuted on January 9, Motorola had added a seventh pipeline stage in the new PowerPC G4 design to achieve faster clock frequencies.
The number of RAM slots was reduced to three, accommodating up to 1. At Macworld Expo New York on July 18, , a new line debuted featuring a cosmetically redesigned case known as Quicksilver , and various upgrades to the specifications. The MHz model was notable for not having a level three cache. Quicksilver received criticism in MacWorld's review for removing the "eject" button and the manual eject pinhole, as well as the pass-through monitor power plug, and for the base specification of MB RAM as being insufficient for running Mac OS X. This was the first Mac to reach 1 GHz.
Again, the low end MHz model did not include any level three cache. All models were available in dual processor configurations running at MHz , 1 GHz or 1. A single processor 1. The last real update to the Power Mac G4 line was on January 28, offering dual 1. Between that, its low price-tag, and the delayed availability of Power Mac G5s, it proved a strong seller for a relatively short time. Production stopped on June 27, and the remaining inventory was liquidated, ending the year legacy of Classic Mac OS support with its discontinuation.
A limited range of serial numbers of this model was noted for a noisy fan, earning them the unofficial designation " Windtunnel G4" in some communities. Noise complaints became such a problem that Apple later replaced the machine's power supply PSU and primary cooling fan with quieter versions, and initiated a voluntary do-it-yourself DIY replacement scheme for all previously sold machines.
It is believed  that the reason for the problem is a bug in the CPU with handling cache coherency in dual cpu setups when switching the CPU to low power states. This is not a repair guide. Replacement Guides Central Processing Unit. Hard Drive. Logic Board. Optical Drive. Power Supply. Video Adapter.
Support Questions Ask a Question. Tools These are some common tools used to work on this device.