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The Early 2009 Mac Pro—also known as the Mac Pro 4,1—introduced Intel's Nehalem architecture to Apple's line of professional desktop computers in March 2009. The Mac Pro 5,1 used the same interior design but received further CPU updates in 2010 and 2012.

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Mac Pro 2009 fans at full speed

My fans on my Mac Pro 2009 are running like crazy. Have already tried cpu replacement. I think it has something to do with the cpu tray. Help Pls!!!!

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Pls awnser!!!


Need more info than provided to give a proper solution. Try using a program like iStat or TechTool Pro to test your fans. You may also need to perform additional hardware tests as you could have a failing logic board or other component. Also, does the machine feel hot to touch, or is it dusty? Cleaning the interior could help. Also reseating the fan connections to the logic board.


Do you have a secondary startup drive? Have to attempted an EFI flash to 5,1? What system are you running? Do you get a POST tone on startup? How stock is it?


neither of those, it is not hot to touch and has a completely clean motherboard


@mstreem when did this start? Has it ever worked properly for you? "Have already tried cpu replacement" replaced with what? You need to give all the details. Everything works properly just your fans that are running "like crazy"?


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did you get this issue resolved? Im having same problem. 2010 A2189 Mac Pro. replaced the RAM / CPU Tray (old one would not start up). Now PC boots and all fans on high

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REset your SMC first

Resetting the System Management Controller (SMC)

The System Management Controller (SMC) 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

• Controlling the fans

It is also recommended that the SMC be reset after a backplane board or processor board is replaced as part of a repair.

Note that resetting the SMC does not reset the PRAM. Resetting the SMC will not resolve issues in which the computer is unresponsive—in these situations, restarting the computer will generally suffice. If the computer isn’t responding, perform these steps one at a time, in the following order, until the issue has been resolved:

1. Force Quit (Option-Command-Escape)

2. Restart (Control-Command-Power)

3. Force Shut Down (press the power button for 10 seconds)

Resetting the SMC can resolve some computer issues such as not starting up, not displaying video, sleep issues, fan noise issues, and so forth. If the computer still exhibits these types of issues after you’ve restarted the computer, try resetting the SMC by removing AC power:

1. From the Apple menu, choose Shut Down (or if the computer is not responding, hold the power button until it turns off).

2. Unplug the AC power cord.

3. Wait at least 15 seconds.

4. Plug the power cord back in, making sure the power button is not being pressed at the

time. Note: Ensure the power button is not pressed when connecting the AC power cord or all fans will run fast.

5. Press the power button to start up the computer.

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