MAC SHUTDOWN CODES MAC
When you hit the return button and validate the command, the Mac will come to a halt and forcefully stop all the processes and applications. So, the syntax line will be something like this – sudo shutdown -h now If you want to close down all the operations and shut down Mac then you will need to use the h flag and give it the command to shut the system immediately. The shutdown command helps you to shut down as well as reboot a Mac using the Terminal. So, any unsaved data will be lost if the apps close suddenly. There’s absolutely no warning dialog, no confirmation or any way to stop the process after the command has been given. Questions? Comments? Have a fix? Post them below or e-mail us!īe sure to check us out on Twitter and the CNET Mac forums.Please bear in mind that the shutting down of the Mac device using the command line method takes place almost immediately. Unfortunately replacing the power supply will require you to have the system serviced by an Apple technician, but may be a simple solution to the random crashes and freezes caused by this issue. Over time power supplies can begin to fail for a number of reasons, and may fluctuate to outputting lower wattage than is necessary to keep the system running.
If so then you likely are experiencing a problem with the power supply on your computer. Once the power manager is reset, start up the system to see if the problem persists. To see the specific steps for resetting the power manager on your Mac, check the following knowledgebase articles or search the Internet for your Mac model (e.g., "iMac") followed by either "PMU" or "SMC" depending on whether or not it is a PowerPC machine or an Intel machine. Some only require shutting off and unplugging the system, whereas others require holding specific key combinations, and others require depressing reset buttons on the motherboard. Unlike resetting the PRAM, the method for resetting the power managers will be different for different Mac models. Let the system cycle through a couple of resets with these keys held, and then release them and allow the system to boot normally. To reset the PRAM, reboot the system with the Option-Command-P-R keys held down. If the diagnostics check out, next try resetting some hardware settings including the PRAM and the System Management Controller (or Power Management Controller on PowerPC systems).
MAC SHUTDOWN CODES PRO
You might also use tools like TechTool Pro (included with AppleCare) to perform more-extensive tests on some system components. Run all of the tools to see if there are any detectable problems with the system components. Insert the boot DVD and start up the system while holding the "D" key, and the system should boot into the diagnostics tools. If this happens, the first thing to do is unplug all peripheral devices and run the hardware diagnostics tools that are included on the gray restore DVDs that came with your system. Unfortunately there is little information on the exact meaning of the number codes used for these events, but when they happen they are because of a hardware-level failure that is resulting in the system crashing. When the system starts back up, the kernel will poll the power manager for any events to output to the system log, and if there was an unexpected shutdown it will output the event to the log. The system will receive the signal, the power manager will store the event as a number code, and then will shut the system down. The power manager can receive the signal for a variety of reasons including user-initiated events, loss of power to the system, a fault in a component, fault in a sensor, or overheating. What is happening here is the system's power manager (called the Power Management Unit or "PMU" on PowerPC machines, and the System Management Controller or "SMC" on Intel machines) is receiving a signal to perform an emergency shutdown of the system, and cuts power to the system in ways that serve to prevent surges and other harmful electrical events. When this happens, the system may show some clue in the system console, but likely it may only be a brief but repeating message that mentions something like the following:ĭec 20 13:33:23 localhost kernel: AppleSMU - shutdown cause = 3 Though the OS X operating system is very robust at handling software-related crashes and hangs, there are times when a problem may be beyond the scope of the operating system's abilities to manage and the system can either crash or freeze.
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