Installing the Lower

Push the lower fan into the computer, aligning the fan with the metal bracket. Notice the location of the two gray bumps on the right side of the fan. These plastic bumps should be in this position for this step. Pull the fan cable through the metal bracket. Pull the fan cable through the metal bracket. 3. As you push the fan, make sure it clears the white tab on the display bezel. Important Notice the position of the gray bumps on the side of the fan. This is the correct position for this...

Replacing the Speaker

Note The speaker set includes the two speakers, speaker housing, and attached cable and connector. 2. Secure the microphone cable to the speaker, and apply new tape. Note A strip of new tape comes with both a replacement speaker set and a replacement microphone cable. 3. Replace the speaker closest to the lower fan. 3. Replace the speaker closest to the lower fan. 4. Route the speaker cable into the cable guides. Then route the fan cable on top of it. 4. Route the speaker cable into the cable...

When I type strange characters appear on the screen

Depending on your iMac's settings, a simple keystroke can change your keyboard from English to Japanese. This can result in some pretty funny characters showing up when you type. To switch to the US keyboard, 3. Click on the International icon. 4. Click on the Input Menu near the top of the screen. 5. Scroll down the list and uncheck any non-US keyboard layouts. 6. Close the System Preferences. Try typing a few characters. Did is solve the problem Yes Problem solved.

Removing the Lower

Locate the metal locking clip on the top of the fan housing. Use a flat-blade screwdriver to raise up the clip approximately 1 4 inch. 2. Push the metal locking clip all the way back until the fan begins to lift out of the computer. 3. Disconnect the fan connector on the logic board. Pull on the black connector not on the cable. 4. Grab the fan by the sides and wiggle the fan upward. As the fan comes up, the fan will bump into a tab on the front bezel. See the next step. 5. Push the fan into...

My mouse works intermittently the cursor freezes randomly

Unplug any USB devices plugged into your computer, other than the Apple Mouse and Apple Keyboard. 2. Reconnect the USB devices one by one and test your mouse after each to figure out which device is causing the issue. Once you have isolated the problem child that isn't playing well with others, you will want to contact the manufacturer of that device to see if they have any suggestions or assistance.

Loud buzzing ticking or whining noise

The computer may make a loud buzzing, ticking, or whining noise when it's on. The sound may vary depending upon screen brightness or processor load. 1. Determine that this noise is related to the computer by removing and shutting down all other devices in the vicinity of the computer that could be causing a sound. 2. Determine if this is a power supply noise. With the iMac G5 on and running, adjust the screen brightness by pressing the F14 and F15 keys on the keyboard. Does the noise change in...

Replacing the Left Antenna Cable

Route the exposed part of the antenna (right side of the chassis) into the cut out (circled) on the chassis. If you are replacing the left antenna cable with a new one, rub away any remaining adhesive on the top of the midplane chassis. Peel off the backing on the replacement antenna cable, and press the antenna holder onto the chassis. Line up the two bumps on the antenna holder with the indents on the chassis. Press the gray label tape on the antenna to the top of the chassis. 2. Route the...

Replacing the Right Antenna Cable

Route the exposed part of the antenna top left side of the chassis into the cut out on the chassis. If you are replacing the right antenna cable with a new one, rub away any remaining adhesive on the top of the midplane chassis. Peel off the backing on the replacement antenna cable, and press the antenna holder onto the chassis. Line up the two bumps on the antenna holder with the indents on the chassis. 2. Route the antenna cable under the metal tabs on the chassis. On the top of the...

None of the keys on my keyboard work

Unplug all devices from your computer, including your mouse and keyboard as well as printer, scanner, external hard drives, and hubs. Warning Some devices may require you to perform steps before it is safe to unplug them, e.g, external storage devices. Be sure to unplug your hub, if you have one. 2. Plug your keyboard into the back of your computer firmly and securely. Plug your mouse into the back of your computer firmly and securely. Take special care to make sure the connector is...

Hear sound out of only one speaker

Are there any external microphones, speakers or headphones plugged into the iMac Yes Disconnect any external microphones, speakers, or headphones. Do you hear audio from both of the built in speakers on your iMac - Yes Good. It looks like the built-in speakers are working properly. This may be an issue with the microphone, speakers or headphones that were plugged into your iMac. Please work with the manufacturer to troubleshoot this issue. No Check your speaker balance. If your balance...

Replacing the Light Pipe with Gasket

Peel the adhesive backing off of the narrower end of the light pipe. 2. Note the small plastic pin on the outer ring of the light pipe. Position the light pipe over the logic board so that the pin aligns with the hole in the logic board. 3. Press the light pipe with gasket into place. 3. Press the light pipe with gasket into place.

Dont hear sound from the speakers

Press the F5 button on your keyboard. It has a sound icon on it. Do you hear sound now Yes It looks like your volume was muted. When this happens again, just press the F4 and F5 keys to regulate your volume. No Are there any external microphones, speakers or headphones plugged into the iMac If yes, go on to step 2. If no, go on to step 3. 2. Disconnect your external microphones, speakers, or headphones. Do you hear sound now Yes It looks like the built-in speakers are working properly. Now...

Psu Imac G5 Not Switch On

Psu Imac Not Switch

The display has no picture or color and no sounds can be heard coming from the fan or hard drive. 1. Verify power outlet is good. Plug a different device into the socket to ensure there is power, or plug the iMac G5 into another outlet. 2. Check the power cord. Use a known good power cord. 3. Check the connection of the power cord on both ends. Verify that the plug is securely plugged into both the AC outlet and back of the computer. 4. Remove keyboard, mouse, and...

Removing the Fan Cover

Touch the metal surface as shown below on the inside of the computer to discharge any static electricity. Warning Always discharge static electricity before you touch any parts or install any components inside the computer. To avoid generating static electricity, do not walk around the room until you have finished installing the part and closed the computer. 4. Using a Phillips 2 for the screw on the left and a Phillips 2 for the screw on the right, remove the two screws....

When displaying a single color over the screen area the LCD panel shows one or more pixels that are not properly lit

Active-matrix LCD technology uses rows and columns of addressable locations pixels that render text and images on screen. Each pixel location has three separate subpixels red, green, and blue that allow the image to be rendered in full color. Each subpixel has a corresponding transistor responsible for turning the subpixel on or off. There are typically millions of these subpixels on an LCD display. For example, the LCD panel used in the Apple Cinema HD display is made up of 2.3 million pixels...

Removing the Optical Drive

Imac How Discharge

Touch the metal surface as shown below on the inside of the computer to discharge any static electricity. Warning Always discharge static electricity before you touch any parts or install any components inside the computer. To avoid generating static electricity, do not walk around the room until you have finished installing the part and closed the computer. Using a Phillips 2 screwdriver, remove the three optical drive screws circled below. Set the screws aside.

Removing the Midplane Assembly

Ambient Light Sensor Imac

Locate the black video cable next to the fans. Using a Phillips 1 screw. Remove the two screws and set them aside. Pull up on the black tab to disconnect the cable. Flip the cable back, so it is out of the way. the cable back, so it is out of the way. 4. Using a Phillips 2 screwdriver, remove six screws. Three short screws are located in the channel along the top of the case and the longer screws attach to the chassis. 5. Loosen the middle power supply screw a captive screwiest screw...

Heatsink Cleaning Procedure

Dust drawn in through the intake grill on the bottom of the iMac can gradually accumulate, eventually degrading the cooling performance of the heatsink by obstructing the air flow. 1. Before you begin, remove the back cover and the midplane assembly. 2. Remove the lower fan from it's mounting bracket to expose the heatsink cooling fins. Note The lower fan does not need to be disconnected from the logic board. 3. With the lower fan removed, carefully inspect the heatsink intake for visible dust...

Removing the Microphone Cable

Screw Microphone Cable

From the top of the logic board at the bottom of the port bank, use a needlenose pliers to disconnect the 3-pin microphone cable left and the speaker cable right . 3. Remove the speaker screw Torx T8 to access the microphone. 4. Pull the speaker forward a bit to access the microphone. Pull the microphone cable through the midplane chassis. 5. Note the routing of the microphone cable. Peel up the speaker tape, and lift up the microphone cable from the speaker channel. Slide the microphone off...

Replacing the LCD Panel

Powerbook Lcd Panel

Check the routing of the LCD panel cables. Note The replacement LCD panel includes the brackets, cables, tape, and gaskets, as shown. 2. Make sure the cables cannot be pinched when setting the LCD panel in the display bezel. 3. Place the LCD panel into the display bezel so that all four screw holes on the brackets align with the screw holes on the bezel. 5. Turn over the display bezel LCD panel assembly, and check that there are no uneven gaps between the bezel and the display. If there are...

Loud fan noise coming from inside the computer

How Replace Cooler Imac

The grill on the bottom of the iMac G5 lets a trio of fans draw cool air into the system. Advanced thermal software spins the fans fast or slow as needed, passing the heated air through a slit on the back cover. As the system usage increases, the fans will adjust their speed using advanced thermal software to meet the cooling needs of the system. Accumulating dust can obstruct the flow of air through the system causing the fans to run faster than normal. In severe cases the system may overheat...

SMU System Management Unit

The iMac G5 uses an advanced system management unit SMU to manage the thermal and wattage conditions, while keeping the acoustic noise to a minimum. The SMU controls the fans and regulates the speeds to run each fan. The SMU supports the following functions provides initial configuration of system clocks automatically initiates and sequences voltage and frequency slews when the OS requests a transition to a new run level handles all power button and environmental user events provides processor...

Computer beeps at startup

Check that the memory DIMMs are iMac G5 compliant. iMac G5 computers work with memory modules DIMMs that meet all of these criteria PC3200, 2.5V, unbuffered, 8-byte, nonparity, 184-pin, 400Mhz DDR SDRAM. There are two RAM slots. The maximum amount of RAM you can install is 2 GB. You can use RAM module sizes of 256 MB, 512 MB and 1 GB, in either slot. DIMMs with any of the following features are not supported in the iMac G5 computer registers or buffers, PLLs, ECC, parity, or EDO RAM. 2....

Replacing the Hard Drive

Imac Hard Drive Sensor Connect

Remove the replacement hard drive from its packaging. 2. Connect the drive data cable and power cable to the hard drive. Lower the hard drive into place on the midplane. 3. Connect the black cable to the white connector on end of the hard drive. 3. Connect the black cable to the white connector on end of the hard drive. 4. Replace the three hard drive screws. 6. Press the video cable into the notch on the midplane chassis. 6. Press the video cable into the notch on the midplane chassis. 4....

Replacing the Midplane

Macbook Screen Inverter Cable Reseated

Position the display bezel assembly with the display face down on a clean soft cloth. 2. Make sure that the TMDS cable is tucked into the groove on the bezel as shown. A cutout on the midplane chassis lines up with the groove on the display bezel assembly 3. Lower the midplane into the display bezel assembly housing. Pull the inverter cable through the opening in the chassis. 4. Line up the jackscrews on the right and left sides of the midplane with the holes in the display bezel assembly....

In a hard drive failure the computer fails to boot to the desktop and may display a flashing question mark or an

Restart the computer with the Apple Hardware Test AHT disc that came with the computer. Run the Quick Extended test. 2. Does the Apple Hardware Test test pass Yes Run Disk repair from the Install CD that came with the computer. No Replace the component indicated by Apple Hardware Test, go on to the next step. 3. Does the computer start up properly now Yes Problem resolved. No Reinstall system software. Go on to the next step. 4. Does the computer start up properly now Yes Problem resolved....

Replacing the Microphone Cable

Secure the microphone cable to the speaker, and apply new tape. Route the microphone cable connector through the chassis opening. 2. Slide the speaker back onto the chassis standoff. Note A strip of new tape comes with both a replacement microphone cable and a replacement speaker set. 4. Turn over the midplane. Connect the microphone and speaker to the logic board. 4. Turn over the midplane. Connect the microphone and speaker to the logic board.

Replacing the Display Bezel

Clean Dust Imac

Before installing the LCD panel and reassembling the computer, make sure the display bezel is clean and free of dust and any foreign matter. 4. Locate the enclosed piece of white microfoam and the two white posts circled on the bezel. 5. With the shiny side of the microfoam facing the bezel, slide the holes of the microfoam onto the two white posts on the bezel. 6. Tuck the mircofoam into place before installing the optical drive. 7. Remove the replacement optical drive from its packaging....

To power the computer on with the back cover off

Status Lights For Imac

Press the power button. The LEDs will come on indicating the computer status. 3. Press the power button. The LEDs will come on indicating the computer status. 4. To shut the computer off with the back cover off, press the power button for at least five seconds. The green LEDs will go out.

Removing the Logic Board

Disconnecting Imac Internal Display

Note Some of these photos are taken from the original iMac G5 logic board take apart since the procedure is very similar. 1. At the top of the logic board, near the fan, disconnect the two fan cables and the two hard drive connectors. 2. Remove the two video cable screws and disconnect the video cable. 2. Remove the two video cable screws and disconnect the video cable. 3. Disconnect the hard drive thermal sensor near the memory slots from the logic board. Leave the other end of the thermal...

Removing the Speaker

Locate the two speakers on the midplane chassis. 2. From the top of the logic board at the bottom of the port bank, use a needlenose pliers to disconnect the two cable connectors microphone and speaker. 3. Turn over the midplane. Peel back the tape securing the speaker cable to the midplane chassis. 3. Turn over the midplane. Peel back the tape securing the speaker cable to the midplane chassis. 5. Without straining the speaker cable, use a flat-blade screwdriver to carefully open the cable...

Replacing Power Supply

Imac Ambient Light Sensor

Remove the replacement power supply from its packaging. 2. The replacement power supply has an ambient light sensor attached with two plastic rivets. Route the ambient light sensor under the power supply. 2. The replacement power supply has an ambient light sensor attached with two plastic rivets. Route the ambient light sensor under the power supply. 3. Locate the notched-out area circled on the logic board. As you lower the power supply into the chassis, make sure the ambient light sensor...

Removing the Power Supply

Loosen the two captive screws circled below . The screws are captive they cannot be removed. 2. Loosen the middle captive screw circled until it's flush with the top of the power supply. This screw attaches to the display bezel make sure to loosen it all the way. 3. Disconnect the ambient light sensor from the logic board. 3. Disconnect the ambient light sensor from the logic board. 4. Turn the middle case screw clockwise about five revolutions. This releases the back cover clamp screw. 5....

Diagnostic LEDs

What Inside Imac

The iMac G5 has built-in diagnostic LEDs shown below on the main logic board that can help you to troubleshoot the computer. To access these LEDs, remove the back cover of the computer 1. Turn your computer off choose Shut Down from the Apple menu . If you can't shut it down that way, you can turn the computer off by pressing the power button for five seconds. 2. After the computer is off, disconnect all cables and the power cord from your computer. 3. Place a soft, clean towel or cloth on the...

The computer will turn on but the display has no picture or color The boot chime the fan and hard drive activity can be

How Check Internal Power For Imac

Check if the computer is sleeping. Press the space bar to wake the computer from sleep mode. 2. Did the computer wake from sleep Yes Put the computer to sleep from the Apple menu and wake the computer again to test the settings. Check Energy Saver setting to see when the computer has been designated to sleep. 3. Reset your computer's PRAM Parameter RAM . If your iMac is on, turn it off by pressing the power button in until the computer powers off. You should hear the drives and fans go...

Replacing the Inverter

Remove the replacement inverter from its packaging. 3. Install the plastic cover on the replacement inverter board. Gently squeeze the board near each tab circled until all five tabs snap onto the board. 4. Connect the white connector on the inverter board to the panel. The connector is keyed, which means it can connect only one way. Route this cable around the silver post to the right of the cable . Important If the connector is not inserted correctly there will be no video on the display...

Replace the logic board Optical disc constantly ejects

Disconnect all peripheral devices, especially the mouse in cases where the disc is constantly ejecting. 2. Try cleaning the disc. If it is dirty or scratched, it may not mount. 4. Boot from Apple Hardware Test hold down the C key at startup or boot from the system install CD use Startup Manager, hold down the Option key at startup . 5. Perform a clean install with the CD that came with the computer.

IMac G inch Ambient Light Sensor

206 Ambient Light

Inverter w o Cover 661-3608 Card, Modem, Soft 922-6492 Logic Board 661-3611 1.8 GHz 661-3612 2.0 GHz Optical Drive 661-3606 Super Drive 661-3605 Combo Drive 661-3616 1 GB, DDR 400 661-3615 512 MB, DDR 400 Antennas 922-6874, Left 922-6875, Right Hard Drive 661-3602 400 GB, 7200, SATA 661-3601 250 GB, 7200, SATA 661-3600 160 GB, 7200, SATA