The computer will not power on

Fan Blind Mate Connector

Plug a different device into the socket to ensure there is power, or plug computer into another outlet. 2. Check the power cord. Use a known good power cord. 3. Check connection of the power cord on both ends. Verify that the plug is securely plugged into both the A C outlet and back of the computer. 4. Remove keyboard, mouse, and other peripherals such as speakers. 5. Position the computer so it rests on the CRT face. 6. Remove the user access door. 7 Touch...

Display Analog Voltage Setting and LHR Module Instructions

The display analog service module contains a non-switching power supply which is preset at a 220V configuration. The voltage selection is manually set by way of a voltage jumper. This means if you are replacing the display analog assembly and you will be operating the computer in a 110V environment, you will have to install the voltage jumper on the module. The following instructions explain how to configure the voltage and LHR jumpers on the digital analog assembly. Note The LHR coil a line...

Flashing question mark appears on the screen

Boot from the system CD that came with the computer and see if the hard drive mounts on the desktop. 2. Boot from Apple Hardware Test hold down the C key at startup . Run both quick and extended tests. Proceed based on any error codes given. See AppleCare Knowledge Base article 112125 - Service Diagnostics Matrix for Error Code information. 3. If no hard drive is found in Drive Setup, verify the hard drive cable connections. 4. Replace the hard drive cable. 5. Reinstall the software drivers...

System hangs during normal startup process

Boot from the system CD that came with the computer and see if the hard drive mounts on the desktop.Boot from Apple Hardware Test hold down the C key at startup . Run both quick and extended tests. Proceed based on any error codes given. See AppleCare Knowledge Base article 112125 - Service Diagnostics Matrix for Error Code information. 2. Using Drive Setup, reinitialize the hard drive. 3. Check all cable connections to and from the hard drive. 4. Replace the hard drive cable.

Thermal Paste Application

The microprocessor uses a heatsink thermal pipe to transfer heat away. Whenever the heatsink is removed, the bottom side of the heatsink and the top of the microprocessor must be cleaned and thermal paste must be applied. If the mating surfaces are not cleaned and thermal paste is not applied, the CPU may overheat and become damaged. This procedure requires the following tools Plastic stylus or nylon probe tool 922-5065 to remove the old thermal paste Thermal paste 922-4757 , each tube contains...

Resetting the PMU on the Logic Board

Pmu Reset Emac

Resetting the PMU Power Management Unit on the logic board can resolve many system problems. Whenever you have a unit that fails to power up, you should follow this procedure before replacing any modules. 1. Save open documents and quit all open applications. 2. Turn the computer off by choosing Shut Down from the Special menu if using Mac OS 9 , or choose Shut Down from the Apple menu if using OS X. 3. Unplug all cables, except the power cord, from the computer. 4. Place the computer face down...

Preliminary Steps

Place the computer face down on an ESD mat. Remove the user access door. 1. Remove the four screws on the Faraday plate. Replacement Note Note the position of the gray cable see red arrow on the top left side of the Faraday plate. Be careful the cable doesn't get pinched when the Faraday plate is replaced. 2. Gently pry the top half of the Faraday plate away from the chassis in the direction of the arrows. Note The gray cable on left rests in a groove under the Faraday plate. 2. Gently pry the...

No sound from the headphones

Verify the problem with known-good headphones. 2. Verify the computer is not set to mute. Press the mute key on the Apple keyboard. 3. Verify volume setting is correct in Mac OS X system preferences. If the preferences are set correctly, replace the logic board. 4. In Mac OS 9, check the Sound Control panel, Speakers tab. When headphones are connected, a headphone icon will be present. If the headphone jack is malfunctioning it may indicate that headphones are connected when none are...

Apple Hardware Test

Apple Hardware Test is a diagnostic tool for detecting problems with Apple internal hardware components such as logic board, memory, modem, video RAM, and Apple AirPort Card. The test does not check externally connected hardware components such as USB or FireWire devices it also does not check nonApple devices such as third-party PCI cards. Note The most recent Apple Hardware Test software can be downloaded from the CD Images page on AppleCare Service Source go to the Service Source home page...