The fastest way to restart depends on what you need

A restart closes every program and clears your computer's temporary memory, then boots the system fresh. Most of the time you restart because something has frozen, an update needs to install, or a program keeps crashing. The method you choose depends on whether your computer is responding to clicks or has stopped altogether.

Windows, Mac, and Linux all restart the same way in principle — you tell the system to shut down and power back on — but the steps differ. This guide covers the three most common restart methods for Windows and Mac, from the gentlest (a normal restart) to the most forceful (holding the power button when nothing else works).

Key Takeaways

  • A normal restart through the Start menu or Apple menu takes two minutes and is the safest choice when your computer is responding normally.
  • If your computer has frozen and will not respond to clicks, hold the power button for 10 to 15 seconds to force a shutdown, then press it again to restart.
  • Windows updates often require a restart; the system will prompt you and usually give you a window of time before it restarts on its own.
  • After a forced restart, Windows and Mac will run a disk check on startup to make sure no files were damaged by the sudden shutdown.
  • Restarting clears temporary files and memory, which often fixes freezing, slow performance, and programs that crash repeatedly.

Normal restart through the Start menu (Windows)

Click the Start button in the lower left corner of your screen. A menu will open showing your apps and a power icon in the lower left of that menu.

Click the power icon. A small submenu appears with three options: Sleep, Shut down, and Restart. Click Restart. Your computer will close all open programs (you may see a prompt asking you to save unsaved work), shut down, and power back on. This takes about one to three minutes depending on your system.

If you have unsaved work in any program, save it before you click Restart. Windows will warn you about unsaved files, but closing them without saving means you lose any changes since your last save.

Normal restart through the Apple menu (Mac)

Click the Apple menu in the upper left corner of your screen. A dropdown menu appears. Click Restart near the bottom of that menu.

A dialog box will ask you to confirm. Click Restart again. Your Mac will close all open programs and ask you to save any unsaved work, then shut down and power back on. This takes about one to three minutes.

If you have documents open with unsaved changes, you can click Cancel in the confirmation dialog, save your work, and then restart again. Mac will also offer to reopen your windows and tabs when it boots back up, so you do not have to manually open everything again.

Force restart when your computer is frozen

If your computer will not respond to mouse clicks or keyboard input, a normal restart is not possible. In this case, hold down the power button on the front or side of your computer for 10 to 15 seconds. The screen will go black and the computer will shut down completely.

Wait 10 seconds, then press the power button once to turn it back on. The computer will boot normally. On the next startup, Windows or Mac may run a disk check to verify that no files were damaged by the sudden shutdown. This check can take several minutes but runs automatically — you do not need to do anything.

A forced restart should be your last resort because it does not give programs a chance to close cleanly. However, it is safe to do and will not damage your files or operating system. If your computer freezes regularly, the problem usually lies with a specific program, a driver that needs updating, or insufficient disk space.

Restart after a Windows update

Windows will notify you when an update is ready to install. You will see a notification in the lower right corner of your screen or a message in the Start menu. The notification usually says "Restart required" or "Update and restart."

Click the notification or the power icon in the Start menu and select Restart. Windows will install the update during shutdown and startup, which may take longer than a normal restart — sometimes 5 to 15 minutes. Your computer may restart more than once during this process. Do not turn off your computer during an update.

If you do not restart right away, Windows will remind you periodically and eventually restart on its own at a time you have not used the computer. You can delay the restart by a few hours, but you cannot skip it indefinitely.

Restart after a Mac software update

macOS will notify you when an update is available. Go to the Apple menu, click System Settings (or System Preferences on older Macs), and look for Software Update. If an update is ready, you will see an "Update Now" or "Restart Now" button.

Click the button to install the update. Your Mac will restart automatically. The installation happens during shutdown and startup and may take 10 to 20 minutes. Your Mac may restart more than once. Do not shut down your computer manually during an update.

If you postpone the update, macOS will remind you again in a few days. Unlike Windows, Mac does not force a restart on its own, but you should install updates within a week or two for security reasons.

What happens during a restart

When you restart, your computer closes every open program and clears the temporary memory (RAM) that programs use while running. This is why a restart often fixes problems: if a program has a memory leak or has gotten stuck in a loop, clearing that memory stops the problem.

Your computer then shuts down completely, powers off, and powers back on. During startup, the operating system loads from your hard drive or solid-state drive into memory, then loads your drivers and background services. This entire process takes one to three minutes on most modern computers.

Any files you saved to your hard drive remain there. A restart does not delete your documents, photos, or programs. It only clears temporary data that programs created while running.

Frequently Asked Questions

Will restarting delete my files?

No. A restart only clears temporary memory and temporary files. All your documents, photos, programs, and settings remain on your hard drive. Anything you saved before the restart will still be there after.

How often should I restart my computer?

Most computers work fine with a restart once a week or once a month. If your computer is slow, freezes often, or programs crash repeatedly, try restarting once a day. If problems continue after daily restarts, the issue is usually a specific program, a driver, or a hardware problem that needs troubleshooting.

Is it safe to force restart my computer?

Yes. A forced restart (holding the power button) is safe and will not damage your files or operating system. However, it does not give programs a chance to close cleanly, so use it only when your computer will not respond to normal restart commands. If you force restart regularly, something is wrong and needs investigation.

What should I do if my computer will not restart?

If the normal restart command does not work, hold the power button for 10 to 15 seconds to force a shutdown. If the computer still will not respond, unplug the power cable, wait 30 seconds, and plug it back in. If problems continue, the issue may be a hardware failure and you may need to contact a technician.

Do I need to restart after installing a program?

Most programs do not require a restart. Some older programs or system-level software (like drivers) may ask you to restart. If a program asks, restart within a few hours. If a program does not ask, you do not need to restart.