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:
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 unresponsive—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:
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.
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:
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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