Procedure

Press and hold the door latch, and then open the AirPort shield door. 2. With the AirPort shield door open, pull the tab to disconnect the ATA ribbon cable connector from the hard drive. 3. Disconnect the power cable connector from the hard drive. You might need to use a flat-blade screwdriver to pry up and loosen the connector. 4. Push in the core latch, and reposition the computer chassis so you can access the heatsink and hard drive. 5. Loosen, but do not remove, the three captive screws...

Startup

Apple Power Mac Book Pinouts

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...

Mac Cube Logic Board Repair

Replacing Logic Board Power Mac

Remove the three Torx T10 spring standoff screws near the center of the board. Replacement Note Reinstall the gold-colored standoff screw in the screw hole closest to the middle large chip. 5. Insert a jeweler's flat-blade screwdriver between the heat spreader and heatsink and gently pry up the heat spreader. 6. Holding the inner mesh shield in place, gently slide out the logic board until the ports clear the I O panel. Replacement Note Make sure the notches on the end of the logic board...

G4 Cube Power Supply Update

Cube Power Supply Update

Place the computer core on its base so the heatsink faces up. Remove the screw that attaches the NMI switch board to the chassis. 2. Push in on the plastic hooks one at a time, and lift the board off of the button panel. 3. Use a black stick to pry up the button panel from the chassis. 3. Use a black stick to pry up the button panel from the chassis. 4. When installing the replacement NMI switch board, ensure the circular buttons align with the round openings in the chassis. 5. Install the...

Power Adapter Verification

Power Mac Cube Pmu

To power on, the computer's logic board requires a trickle power of 28 V. If the system fails to power on, first reset the PMU. Then follow the procedure below to determine if the symptom is related to the external power adapter. Note To verify the power adapter, you need a volt meter. When connecting the volt meter leads to specific pins, make sure the power adapter cable remains securely plugged into its connector on the logic board. 1. Ensure all cards and cables in the computer are securely...

Resetting the PMU on the Logic Board

Pmu Reset Switch

The PMU Power Management Unit is a microcontroller chip that controls all power functions for this computer. The PMU is a computer within a computer. Its function is to tell the computer to turn on, turn off, sleep, wake, idle, etc. manage system resets from various commands. maintain parameter RAM PRAM . manage the real-time clock. Important Be very careful when handling the logic board. The PMU is very sensitive and touching the circuitry on the logic board can cause the PMU to crash. If the...

R

Mac Mini Replacement Fan

Holding the edge of the video card, disconnect the 28.5-volt power cable connector from the video riser card at J3. 7. Disconnect the 28.5-volt power cable from the logic board. To install the replacement power cable, use a needlenose pliers to align the cable with the connector. 8. Install the replacement 28.5-volt power cable, and reassemble and test the computer. Warning Never turn on the computer unless all of its internal and external parts are in place and it...