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 Xserve. If the Xserve is experiencing any power issue, resetting the SMC may resolve it. The SMC controls several functions, including:

  • Telling the Xserve 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 on any new logic board after it is installed 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 Xserve is unresponsiveā€”in these situations, restarting the Xserve will generally suffice. If the Xserve 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 Xserve issues such as not starting up, not displaying video, sleep issues, fan noise issues, and so forth. If the Xserve still exhibits these types of issues after you've restarted the Xserve, try resetting the SMC. There are two ways to reset the SMC on the Xserve.

To reset the SMC in the Xserve (Late 2006):

  1. Shut Down the Xserve, either locally or using remote commands (or if the Xserve 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.
  5. Press the power button to start up the Xserve.

Real Time Clock (RTC) Reset

The Real Time Clock (RTC) is a chip on the logic board that controls the date and time functions of the Xserve. If the Xserve is experiencing an issue booting, resetting the RTC may resolve it. Follow these steps to reset the RTC:

  1. Shut Down the Xserve, either locally or using remote commands (or if the Xserve is not responding, hold the power button until it turns off).
  2. Unplug the AC power cord.
  3. Remove the battery for at least 20 seconds.
  4. Reinstall the battery and wait 5 seconds, then press the power button on the front panel to start up the Xserve.
  5. You will need to re-set the system date and time to the current date and time since these parameters will be reset when the RTC is reset.

System Reset

The Xserve has a system reset switch on the logic board that may be used to restart the Xserve while it is powered up. This switch can be used to determine if a Xserve that won't consistently boot from a cold start has power supply issues. Follow these steps to reset the system:

With the Xserve powered up, press the SYS_RST switch located on the logic board to the rear of the FB-DIMM slots.

If the Xserve boots after you press the SYS_RST switch, try shutting the Xserve off and restarting by pressing the front panel power button. If the Xserve restarts when you press the SYS_RST switch but not from a cold start, the power supply may need to be replaced.

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Responses

  • Negassi
    How can start xserve power button not responding?
    8 years ago
  • MIRABELLA
    What are all of the reset buttons on xserve g5 board?
    8 years ago

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