It is always preferred to shut a Mac down or restart it by using the options in the Apple menu. 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. However, there are times when a hard reset may be necessary, which besides obvious kernel panics, includes system freezes and hangs. These are generally characterized by the following behaviors:. Kernel panics: When these happen, the screen darkens and instructs you to press and hold the power button. System freezes: When this happens, the system will not respond to any input.
The mouse cursor will be frozen and the keyboard's caps lock key light will not change when pressed. On laptop systems the screen may not shut off when the lid is closed. 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. In the case of system hangs, many times the problem will eventually clear itself if you are patient. 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. 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).
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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). 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. 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. There are two ways to perform a hard reset. The first is to press and hold the power button for the system for about 5-10 seconds.
The second method is to unplug the power sources for the computer (which can include batteries for laptop systems with removable ones). 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. In this case you will need to unplug the power from the system to shut it down. 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. Lastly, one reason why the system may hang is if the hard drive is going bad.
Healthy drive chatter is usually a random grinding sound. If the drive is making any regular patterns of clicking, clunking, or ticking noises, then it could be going bad and be the root cause for the system slowdowns and hangs. In this case, cutting the power will be needed and can be done without first monitoring the drive for a break-in activity. Post them below! Be sure to check us out on and the.
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