User Guide
Table Of Contents
- Mac Pro (8x)
- Contents
- Basics
- Take Apart
- General Information
- Opening the Computer
- Hard Drives
- Optical Drive Carrier and Optical Drives
- Memory (FB-DIMMs) and Memory Riser Cards
- PCI Express/Graphics Card
- Power Supply
- Power Supply Fan
- AirPort Extreme Card
- Bluetooth Card
- Battery
- Processor Heatsink Cover
- Front Fan Assembly
- Mac Pro RAID Card and Battery
- Memory Cage with Rear Fan
- Processor Heatsinks
- Processors
- Speaker Assembly
- USB Cable
- Logic Board
- Front Panel Board
- Power Button
- AirPort Antenna Board with Cables
- Optical Drive Power Cable
- Optical Drive Data (Ribbon) Cable
- Ambient Board
- Ambient Board Cable
- Bluetooth Antenna Board and Cable
- Hard Drive Cable Harness
- Hard Drive Temperature Sensor Cable
- Hard Drive Temperature Sensor
- Power Cable Harness
- Troubleshooting
- Upgrades
- Views
Mac Pro (8x) Troubleshooting — Symptom Charts 152
Fans
Individual fan failure
Verify fan is properly connected.1.
Verify all other fans are working properly. If all fans seem to have failed, the problem is most 2.
likely not the fans. Reset the logic board to see if this resolves this problem.
Replace fan3.
Replace logic board 4.
Fans run at high speed (computer may shut down or may just hang and not shut
down as a result)
Check for proper ventilation around the exterior of the computer. 1.
If the system is operating normally except for all fans running at full speed, try resetting the 2.
SMC.
If the system appears to be hung (unresponsive), then it’s normal behavior for all fans to 3.
ramp to full speed. In this case, troubleshoot any possible operating system, RAM, processor,
logic board, and power supply issues, in that order.
Remove the computer’s side access panel and observe the diagnostic LEDs, specically LED 4.
4 and LED 5 (the CPU A and B Overtemp LEDs). Refer to “Diagnostic LEDs” in this chapter for
more information on how to locate and interpret these LEDs. If either LED is ashing, it may
indicate an initial processor over-temperature condition. If either LED is solidly on, it may
indicate a chronic processor over temperature condition.
Verify proper processor heat sink installation (see the take apart section for more information 5.
on heat sink installation).
Verify all thermal sensors and their cables are properly connected, especially the ambient 6.
temperature sensor board.
Verify all fans are operating properly and are unobstructed, especially the front intake fan.7.
Verify that the proper type of memory is installed. (See “8. Memory” in the Take Apart chapter
for more information.)
Replace power supply.9.
Computer performance seems sluggish or slow, or computer is completely hung
Start up the computer from a known-good volume, such as its Installation disc, or an external 1.
hard drive, to isolate the issue to software or hardware. If the computer seems to perform
adequately when booted in this way, troubleshoot as a software issue. If the computer
continues to perform sluggishly when booted this way, continue following the steps below.
Run Apple Service Diagnostic to verify hardware is functional. Address any diagnostic failures 2.
as necessary.