Startup Failures

When testing a computer for the following symptoms, remove the side access panel so you can better observe or listen for fan movement. Note Be sure to check the Memory and Power-On Self Test topics in the General Information section of this chapter. Incorrect installation of DIMMs or incompatible memory will not allow the system to start up correctly. For information on how to correctly install DIMMs, see the Memory (DIMMs) topic in the Take Apart chapter. Important For troubleshooting...

Procedure

Note This procedure illustrates how to remove the upper processor (CPU A). The instructions are the same for removing the lower processor (CPU B). 1. Release the latch on the metal processor holder. Note You may want to use a flat-blade screwdriver to release the latch. 2. Rotate the top of the holder to the open position. 2. Rotate the top of the holder to the open position. 3. Placing a finger in the notch at the front of the processor holder, pry up the processor and lift it out of the...

PCI Express Graphics Card

The Mac Pro Early 2008 logic board includes one double-wide PCI Express graphics slot and three PCI Express expansion slots, for a total of four slots. The computer comes with a graphics card installed in slot 1. You can install additional PCI Express graphics and expansion cards in the remaining three PCI Express expansion slots. Important Graphics cards from previous Power Mac G5 models are not compatible with Mac Pro Early 2008 models. In addition, Mac Pro Early 2008 graphics cards are not...

Location Of Main Logic Board Temperature Sensors Mac

Disconnect the hard drive temperature sensor cable from the logic board. 2. Disconnect the four connectors on the hard drive temperature sensor cable from the four hard drive temperature sensors. 3. Remove the hard drive temperature sensor cable from the enclosure. Replacement Note The connectors on the hard drive temperature sensor cable are labeled with HDD1, HDD2, HDD3, and HDD4 to indicate the connector that belongs to each temperature sensor. There are four hard drive temperature...

Mac Pro 2008 Power Supply

Disconnect the sensor cable for the hard drive in bay 1 and move the cable out of the way. 2. Using a mirror, locate the two round black nubs on the bottom of the hard drive sensor below hard drive bay 1. 3. Using a black stick or a flat-blade screwdriver, press up on the nubs and remove the sensor from the enclosure. The power cable harness consists of the following cables Power supply PS4 control cable Front panel board power cable Front panel board audio cable Front panel board FireWire...

Memory FBDIMMs and Memory Riser Cards

Mac Pro 2008 Fbdimm Riser

The Mac Pro Early 2008 computer has two memory riser cards with a total of 8 memory slots. On each card, the slots are arranged as two banks of two slots each. The computer comes with a minimum of 2 GB of memory, installed as a pair of 1 GB fully buffered, dual inline memory modules FB-DIMMs in two of the DIMM slots. Additional pairs of 1 GB, 2 GB, or 4 GB FB-DIMMs can be installed in the open DIMM slots, for a maximum of 32 GB of memory. It's important to install FB-DIMMs in matched pairs of...

Part Location

Disconnect the Northbridge heatsink cable from the logic board. 1. Disconnect the Northbridge heatsink cable from the logic board. 2. Using a long-handled, magnetized 3 mm flathead hex screwdriver, loosen the four captive heatsink mounting screws in the order indicated below. 3. Lift the heatsink straight up out of the enclosure. Replacement Note When installing the heatsink, lightly tighten the mounting screws in the order indicated below.Then tighten the screws again in the same order to...

Processor Heatsinks for and GHz Processors

This procedure applies to 2.8 GHz and 3.0 GHz configurations of the Mac Pro Early 2008 . For the 3.2 GHz configuration, see the procedure Processor Heatsinks for 3.2 GHz Processors. Note The heatsink for 2.8 GHz and 3.0 GHz processors requires thermal grease for proper operation. Every time you remove the processor heatsink, you must replace the thermal grease. New grease and alcohol wipes for cleaning off the previous grease are included with replacement processors and logic boards....

Where Is Bluetooth On Macbook

Macbook Pro Bluetooth Antenna

Using needlenose pliers, gently grasp the Bluetooth antenna board and pull it out of its mounting. 2. Remove the tape holding the Bluetooth antenna cable to the enclosure. 2. Remove the tape holding the Bluetooth antenna cable to the enclosure. 3. Remove the antenna board and antenna cable from the enclosure. 3. Remove the antenna board and antenna cable from the enclosure.

Safety and First Aid Guidelines

Below is a summary of safety and first aid measures for exposure to the coating on the processor heatsink and processor or the Krytox grease used in sealing the processor heatsink to the processor. For complete instructions, refer to the specific Material Safety Data Sheets MSDS included with the replacement parts. Avoid contact with eyes. Avoid contact with skin. Wash thoroughly after handling. Do not store or consume food, drink, or tobacco in areas where they may become contaminated with the...

Identifying Mac Pro Early Computers

To identify a Mac Pro Early 2008 computer, check the configuration code on the computer's configuration label, which is located on the computer's back panel directly below the video ports. See the following section Serial Number Location. One other quick way to identify the computer is to open the side panel and inspect the memory cage. The Mac Pro Early 2008 memory cage has a cross bar and looks like the following

Take Apart

General Information 13 Orientation 13 Tools 13 Parts Requiring Enclosure Replacement 13 Note on Illustrations 13 Optical Drive Carrier and Optical Drives 1 9 Memory FB-DIMMs and Memory Riser Cards 23 Front Fan Assembly 51 Mac Pro RAID Card and Battery 56 Memory Cage with Rear Fan 62 Northbridge Heatsink 68 Processor Heatsinks for 2.8 and 3.0 GHz Processors 71 Processor Heatsinks for 3.2 GHz Processors 78 AirPort Antenna Board with Cables 118 Optical Drive Power Cable 122 Optical Drive Data...

Bluetooth Antenna Board and Cable

If you are working on a Mac Pro Early 2008 Dual 3.2 GHz , do not allow the heatsink to be separated from the processor for more than 30 minutes. If you are ordering a new Bluetooth antenna board, reassemble the unit while you are waiting for the part to The Bluetooth antenna cable is part of the Bluetooth antenna board assembly. To remove or replace the cable, you must replace the antenna board assembly.

Installing New Heatsinks

If you are installing a new heatsink, do not apply new grease to either the heatsink or processor, as the replacement heatsink comes with the full capacity of grease applied. Note When installing a new heatsink, be sure to remove any residual grease from the top edges of the heatsink's processor. To clean off the grease, do the following Remove the processor from its holder on the logic board. See Processors, 3.2 GHz in this chapter. Using first the lint-free cloth and then the alcohol wipe...

Exploded View

Hard Drive Temperature Sensor Cable 922-8522 Front Panel Board Power Cable 922-8490 Front Panel Board Audio Cable 922-8560 Front Panel Board Power Cable 922-8490 Front Panel Board Audio Cable 922-8560 Front Panel Board FireWire Cable 922-8561 Front Panel Board USB Cable 922-8494

Power Supply Verification

To power on, the computer's logic board requires trickle power. If the system fails to power on, first reset the SMC as described in this chapter. If the computer still doesn't power on, follow the procedure outlined below to determine whether the issue is related to the power supply. Diagnostic LED 2 indicates the presence of trickle power required by the logic board to begin the startup process. LED 2 should be yellow when the DIAG_ LED button is pressed, indicating that trickle voltage is...

Led Cpu B Lower Processor Overtemp Led Cpu A Upper Processor Overtemp

These LEDs come on if an error occurs. They do not depend on the DIAG_LED button being pressed. These two LEDs can operate in two different modes they will either flash or stay on. If either LED is flashing, it may indicate an initial processor over-temperature condition. If either LED is solidly on, it may indicate a chronic processor over-temperature condition. Initial processor over-temperature can cause symptoms such as sluggish computer performance. Chronic processor...

Mac Pro Firmware Updates

Firmware is the name given to software that is written into memory circuits, such as flash memory, that will hold the software code indefinitely, even when power is removed from the hardware. Firmware on Intel Mac computers is designed to be updated if necessary through a software update. EFI and SMC firmware is stored on the Mac Pro Early 2008 logic board. EFI firmware updates update the Boot ROM, and SMC updates update the System Management Controller firmware. The SMC manages fans and other...

Processor Heatsink and Processor Visual Inspection Instructions

The Mac Pro Early 2008 Dual 3.2 GHz computer uses a special coating on the processor heatsink and processor to manage the temperature in the computer. Before installing a new or existing heatsink or processor, always make a visual inspection of the part. Specifically, check the application of the silver-colored coating on the underside of the heatsink and the top of the processor. In addition, check the condition of the gasket that surrounds the coating on the heatsink. Important When...

Handling Instructions

Use these guidelines when handling the Mac Pro Early 2008 processor heatsink and processor General Wear disposable nitrile or latex gloves when handling the processor heatsink and processor. Avoid touching the silver coating on the underside of the heatsink and the top of the processor. Use care when removing the heatsink from the computer. As much as possible, lift the heatsink straight up off the processor. Use care when removing the processor from the logic board. Lift the processor out of...

PowerOn Self Test RAM and Processor Verification

A power-on self test in the computer's ROM automatically runs whenever the computer is started up after being fully shut down the test does not run if the computer is only restarted . If the test detects a problem, the status LED located above the power button on the front of the computer will flash in the following ways 1 Flash No RAM is installed or detected. Or, the quick memory test failed. An LED will light up on the memory riser card next to the affected DIMM or empty DIMM slot. 3 Flashes...

Led Gpu Present

Normally on when DIAG_LED button is pressed. If this LED is on, it indicates there is a graphics card installed and recognized by the computer. It does not indicate that the graphics card is fully functional. Some graphics cards require additional power to function, which is available from connectors on the logic board. For these cards, if the auxiliary booster power cable is not connected between the logic board and the graphics card, an error message reminding about this additional power...

Replacement Procedure

Preparing an Existing Heatsink for Re-installation If you are reinstalling an existing processor heatsink, complete steps 1-4 below for applying new thermal grease to the underside of the heatsink. If you are installing a new heatsink, do not apply thermal grease and skip to the next section, Preparing a New Heatsink for Installation. 1. Using the alcohol pad included with the logic board or processor replacement part, clean off any used thermal grease from the processor and the bottom of the...

PCI Express Cards

Mac Pro Pci Expansion Cards

The Mac Pro Early 2008 logic board includes one double-wide PCI Express graphics slot and three PCI Express expansion slots, for a total of four slots. The computer comes with a graphics card installed in slot 1. You can install additional PCI Express graphics and expansion cards in the remaining three PCI Express expansion slots. Important Combined maximum power consumption for all four PCI Express slots must not exceed 300 W.

Processor Heatsinks for GHz Processors

If you need to install a new heatsink or processor, reassemble the unit while you are waiting for the new part to arrive. The Mac Pro Early 2008 Dual 3.2 GHz computer uses a special coating on the processor heatsink and processor to manage the temperature in the computer. The silver-colored coating comes applied to the underside of the heatsink and the top of the processor. Use the following guidelines when handling the processor heatsink and or processor Wear disposable nitrile or latex...

Led Efi Good

Normally on when DIAG_LED button is pressed. Takes approximately 5 seconds after power up. If this LED is on, it indicates that the computer has completed the on board Extensible Firmware Interface EFI operations and the operating system is now in control. Check that LED 8 Power Good LED is on. Check that LEDs 3, 4, 5, and 6 are off. Try removing any added hardware. Try removing any added DIMMs. Both of the memory riser cards include diagnostic LEDs for each DIMM. Each of the LEDs will light if...

Mac Pro Power Supply

Remove 2008 Early Mac Pro Power Supply

Disconnect the power cable harness connectors from the logic board. 2. Using a Phillips screwdriver, remove the two mounting screws on the power supply cable cover located at the back of the optical drive bay. 3. Slide the cover toward the top of the enclosure, tilt it up until the two tabs on the cover clear the slots in the media shelf, and remove the cover from the enclosure. Replacement Note Replace the cover at an angle so that the tabs engage with the slots in the media shelf. Then...

Led Cpu B Lower Processor Error Led Cpu A Upper Processor Error

These LEDs come on if an error occurs or if the BootROM is corrupted. They do not depend on the DIAG_LED button being pressed. Related symptoms include no video or the computer is hung up. If the BootROM is corrupted, the optical drive tray should eject, prompting for the insertion of a recovery disc to restore the BootROM. With the computer booted, up press the SYS_RST switch. If this clears the CPU Error LED, check for incompatible device driver software that may have been...

Resetting the Logic Board

System Management Controller SMC Reset The System Management Controller SMC is a chip on the logic board that controls all power functions for the computer. If the computer is experiencing any power issue, resetting the SMC may resolve it. The SMC controls several functions, including Telling the computer when to turn on, turn off, sleep, wake, idle, and so forth Handling system resets from various commands It is also recommended that the SMC be reset after a logic board, ambient board, or...

Diagnostic LEDs

Powermac Diagnostic Led

The Mac Pro Early 2008 logic board includes a set of LEDs to help service providers troubleshoot the computer. The LEDs are located on the logic board between the two DIMM riser card connectors. LEDs 3, 4, 5, and 6 are normally off and will automatically illuminate if an error occurs. To read LEDs 1, 2, 7, 8, and 9, you must press the DIAG_LED button, which is adjacent to the LEDs. To press the DIAG_LED button, use the nylon probe tool Apple part number 922-5065 . Use the following table to...