- #Mac shutdown key command verification#
- #Mac shutdown key command code#
- #Mac shutdown key command mac#
While you should always be cautious about performing hard resets, you should be especially cautious about performing one when the hard drive is working.
#Mac shutdown key command verification#
When the system finally boots, log in and run Disk Utility's drive verification to check the hard drive for errors an additional time, and if there are no problems, then restart normally. One easy way to do this is to immediately boot into Safe Mode by holding the Shift key during the next start-up, which will run a drive verification and repair in addition to other maintenance tasks. Jan 13 19:39:09 Tophers-Desktop InternetSharing: Internet Sharing shutting downĪfter a hard reset, the system will not perform any automatic diagnostics such as checking the file system for inconsistencies, so you might consider taking the initiative to perform these checks yourself the next time you turn on the system. Jan 13 19:39:09 Tophers-Desktop InternetSharing: DNS server (named) exited, shutting down Jan 13 19:38:00 Tophers-Desktop : System shutdown time has arrived^G^G Jan 13 19:38:00 Tophers-Desktop : Shutdown NOW! Jan 13 19:38:00 Tophers-Desktop shutdown: reboot by tkessler: This differs from the logs of a normal shutdown, which look like the following: Jan 13 19:38:00 localhost kernel: Previous Shutdown cause: 5 Jan 13 19:38:00 localhost kernel: systemShutdown false
Jan 13 19:38:00 localhost DirectoryService: Improper shutdown detected
#Mac shutdown key command code#
This will be be read by the kernel the next time the system is powered up, and will be recorded in the system logs in a manner similar to the following (in this case the shutdown code was "5"): When the system is hard-reset, the system management controller will capture and save a shutdown state code that will indicate the source of the power loss.
In this case you will need to unplug the power from the system to shut it down. In rare cases the system may not shut down when you press and hold the power button, which indicates that the system management controller (SMC) has likely hung or crashed along with the OS. The second method is to unplug the power sources for the computer (which can include batteries for laptop systems with removable ones). The first is to press and hold the power button for the system for about 5-10 seconds. There are two ways to perform a hard reset. If a hang will not clear even after waiting and quitting applications, or if the system has frozen or is in a kernel panic, then performing a hard reset may be your only option. Repeat this with other applications until the slowness clears itself, and then go buy more RAM, limit the number of applications you open, or limit the number and size of the documents you open with those applications. Then press Command-Q to quit it and wait for the system to accept that command and close the application (which may take another few minutes). The best way to clear this situation is to click one application in the Dock and wait for it to come into focus (which may take minutes). These will more often happen if the system has run out of RAM then the system may slow to a crawl while it manages active system processes and applications through virtual memory. In the case of system hangs, many times the problem will eventually clear itself if you are patient. System hangs: When these happen, the system will likely show a moving cursor (albeit the spinning color wheel) and the keyboard will respond, but the system will not accept any inputs or key commands and will stay like this for minutes on end. On laptop systems the screen may not shut off when the lid is closed. The mouse cursor will be frozen and the keyboard's caps lock key light will not change when pressed. System freezes: When this happens, the system will not respond to any input.
Kernel panics: When these happen, the screen darkens and instructs you to press and hold the power button. These are generally characterized by the following behaviors:
However, there are times when a hard reset may be necessary, which besides obvious kernel panics, includes system freezes and hangs. This allows services to be stopped, settings and documents to be saved, and hardware to be cleanly unmounted and put in a state where it's ready to be shut off.
#Mac shutdown key command mac#
It is always preferred to shut a Mac down or restart it by using the options in the Apple menu.
0 kommentar(er)
