While Macs are famous for their stability, they are still complex computers. Over weeks of continuous use, background processes can crash, memory can become fragmented, and applications might start behaving erratically (e.g., Safari refuses to load pages, or the mouse cursor begins lagging). Furthermore, installing a major macOS update requires a clean slate to apply the new system files. In these situations, simply closing apps or putting the computer to sleep will not fix the issue. You need to Restart the Mac. Restarting completely flushes the system’s temporary memory (RAM), shuts down all background services, and boots the operating system fresh from the hard drive, instantly curing 90% of all software glitches.
Step-by-Step: The Standard Restart
The safest and most common way to reboot the machine is through the main Apple menu, allowing the system to save data gracefully.
- Navigate your mouse to the top-left corner of the screen.
- Click the Apple Logo (\uf8ff).
- Select Restart… from the drop-down menu.
- A dialog box will appear in the center of the screen, warning you that the computer will restart automatically in 60 seconds.
The “Reopen Windows” Checkbox
Look closely at that confirmation dialog box. There is a small checkbox labeled: “Reopen windows when logging back in.”
- If you leave it checked (Default): The Mac will reboot, and when you log back in, it will automatically launch every single app and browser tab you were just using. This is convenient if you are just installing an update.
- If you uncheck it: The Mac will reboot to a completely clean, empty desktop. You must uncheck this box if you are restarting to fix a glitch. If a frozen app was causing the glitch, allowing the Mac to automatically reopen that frozen app will just bring the glitch back.
- Once you have decided on the checkbox, click the blue Restart button to execute the command immediately.
The Forced Restart (When the Mac is Completely Frozen)
Occasionally, a Mac will completely lock up. The screen freezes, the mouse cursor won’t move, and the Apple menu is inaccessible. In this emergency scenario, you cannot use the software to restart; you must force the hardware to reboot.
- On a Desktop Mac (iMac, Mac mini, Mac Studio): Reach around to the back of the machine. Press and hold the physical power button down firmly. Keep holding it for about 10 seconds until the screen goes completely black and the machine goes silent. Release the button, wait 3 seconds, and press it once more to turn the Mac back on.
- On a MacBook (Air or Pro): Press and hold the Touch ID button (or the blank power button) in the top right corner of the keyboard. Hold it down for 10 seconds until the screen turns black. Release it, then press it once to boot back up.
Warning: A forced restart instantly kills power. Any unsaved work in open documents will be permanently lost. Only use this method if the machine is completely unresponsive.