Mac Pro (Mid 2010) General Troubleshooting — Common Reset Procedures 30
2010-08-31
Common Reset Procedures
The following reset procedures are often helpful in troubleshooting Mac Pro issues.
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 o, 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 generally
works. 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 o).
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.
5. Press the power button to start up the computer.
For more information:
http://www.apple.com/support
HT1411—Mac Pro: How to reset the System Management Controller (SMC) <http://
support.apple.com/kb/HT1806>
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