No sound from computers internal speaker

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. Clear parameter RAM. Hold down Command-Option-P-R during startup until you hear a second startup chime. 4. Verify the speaker cable is plugged into the logic board. 5. Plug headphones into the headphone jack. If you don't get sound via the headphone jack, try connecting external speakers to the audio line-out port on the...

Clicking or clunking type noise heard from Power Mac G Mirrored Drive Doors computer

This noise is due to the fan blades hitting the gasket that surrounds the air intake openings. 1. Check that the noise is coming from the power supply fans by briefly disconnecting the processor fan and optical bay fan. Important Do not close the door and operate the computer with these fans disconnected. 2. If the noise is coming from the fans, replace the power supply. Note Service stock does not contain any power supplies with this issue. Related Knowledge Base article 86128 Power Mac G4...

Preliminary Steps

Remove the optical drive carrier. Warning The power supply in this computer is a high-voltage component and should not be opened for any reason, even when the computer is off. 1. Use a T-10 Torx driver to remove the power supply screw from the back panel. 3. Disconnect the power supply cables from all drives and from the logic board. Note For the Power Mac G4 FW 800 model of the computer, press and hold the tab on the black, plastic connector cover as you pull up...

Before Replacing the Processor

Mirror Drive Door Motherboard

Important Apple has determined a compatibility issue between the processor and certain fabrication levels of the logic board on some Power Mac Server G4 Mirrored Drive Doors and Power Mac G4 Mirrored Drive Doors products. Before ordering a replacement processor for those models, follow these steps 1. Open the computer and check the fabrication number that is printed on the logic board. The fabrication number is easily visible at the edge of the board near PCI card slot 5. 2. If the logic board...

Screen is black but startup chime is present drive operates fan is running and power LED is lit

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. 5. Clear parameter RAM. Hold down Command-Option-P-R during startup until you hear a second startup chime. 6. Reset the logic board. Refer to Resetting the PMU on the Logic Board in this chapter.

Serial Number Location

The computer's serial number is located on the back panel. Before Opening the Computer Warning The power supply in this computer is a high-voltage component and should not be opened for any reason, even when the computer is off. Warning After shutting down the computer, you must wait a few minutes before servicing it to allow internal components to cool. Important The only way to shut off power completely to the computer and display is to disconnect their power plugs from the power source. Make...

Hard drives connected to ATA bus are not recognized

Check all cable connections to the hard drive. 2. Try another power connector on the power cable harness. If the power connector is defective, replace the power supply. 3. Verify that you are booting with the discs that shipped with the unit, or are known compatible with the unit. Note that booting with an incompatible version of the OS may mean that the necessary drivers to recognize the ATA-100 bus are not installed, and therefore any devices connected to that bus will not be recognized....

USB printer does not operate

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. Use Print Center 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...

Optical drive tray wont open

Power Mac Disc Drawer

Before opening the computer, try the following Note When following the steps below make sure that there is power to the computer and to the Apple Pro Keyboard and Apple Pro Mouse. Press the Eject key on Apple Pro Keyboard. To open the second optical drive on a Power Mac G4 Mirrored Drive Doors computer, press Option-Eject on the Apple Pro Keyboard. Open the Eject application found in the Eject Extras folder. The Eject Extras folder is located in the Apple Extras folder on the CD. Click the...

Power Supply Verification

To power on, the computer's logic board requires a trickle power of 5V. If the system fails to power on, first reset the PMU. Then 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. When connecting the volt meter leads to specific pins, make sure the power supply remains securely plugged into its connector on the logic board. The following figure shows the pins and voltage on the computer's...

Mirrored Drive Door

Repairing Broken Handle Powermac

Remove the two Phillips screws attaching the right side panel to the metal chassis. 4. Using needlenose pliers, squeeze the plastic tabs protruding through the chassis , to release the right side panel from the metal chassis. 5. Remove the right side panel from the chassis. 5. Remove the right side panel from the chassis. Replacement Note When installing the replacement right side access panel, make sure the latch is closed, and the metal latch spring pin inside the chassis fits under the...

Flashing question mark appears on the screen

Start up from the system restore CD and check to see if the hard drive shows up in the Disk Utility. If it does, go to step 2. If it does not, go to step 4. 2. Run Disk Utility. Update the driver and restart the computer. 3. Reinstall system software using the system restore CD that came with the computer. 4. If you are starting up in Mac OS 9, turn off your Mac OS 9 system extensions Start up the computer while holding down the Shift key. If the computer is set to start up from another...