The fastest way to reboot depends on your operating system

A reboot clears your computer's memory, closes all running programs, and restarts the operating system from scratch. On Windows, the quickest method is to hold the power button for ten seconds until the screen goes black, then press it again to turn the machine back on. On Mac, click the Apple menu in the top-left corner, select Shut Down, check the box that says "Reopen windows when logging back in," and click Shut Down again — this restarts the system after it powers off. On Linux, open a terminal and type sudo reboot, then press Enter.

A soft reboot (using the operating system's restart command) is gentler on your hardware than a hard reboot (holding the power button), because it gives programs time to close properly and saves any unsaved work that the system can recover. Use a soft reboot whenever your computer is responding. Use a hard reboot only when the screen is frozen or the system will not respond to keyboard or mouse input.

Key Takeaways

  • On Windows, go to Start menu, select Power, and click Restart to perform a soft reboot.
  • On Mac, click the Apple menu, select Shut Down, check "Reopen windows when logging back in," and confirm.
  • On Linux, open a terminal, type sudo reboot, and press Enter to restart the system.
  • A hard reboot (holding the power button for ten seconds) works when your computer is frozen, but a soft reboot is safer for your hardware when the system is still responding.

Windows: Using the Start menu to restart

Click the Start button in the bottom-left corner of your screen. A menu will open showing your installed programs and system options. Look for the Power button icon — it usually appears in the bottom-right area of the Start menu, or you can type "power" in the search box at the top of the menu to find it faster.

Click the Power button. A small menu will appear with three options: Sleep, Shut Down, and Restart. Click Restart. Windows will close all open programs and files, shut down the operating system, and automatically power the computer back on. The restart usually takes between one and three minutes, depending on how many startup programs your system runs.

Windows: Using the keyboard shortcut

If your Start menu is not responding, you can restart using the keyboard. Press Alt + F4 repeatedly until all open windows close. Once the desktop is empty, press Ctrl + Alt + Delete. A blue screen will appear with several options in the bottom-right corner.

Click the Power button icon in the bottom-right corner. A menu will pop up with Sleep, Shut Down, and Restart options. Click Restart. This method works even when the Start menu is sluggish or partially frozen, because it bypasses the normal menu system and goes directly to Windows' core shutdown controls.

Mac: Restarting through the Apple menu

Click the Apple logo in the top-left corner of your screen. A dropdown menu will appear. Look for the option labeled Shut Down — do not click it yet. Instead, hold down the Shift key on your keyboard and click Shut Down while holding Shift. This tells Mac to restart instead of powering off completely.

Alternatively, click Shut Down without holding Shift, then when ready after the computer powers off, press the power button to turn it back on. If you want Mac to reopen all your windows and programs automatically after the restart, click Shut Down, check the box that says "Reopen windows when logging back in," and then click Shut Down again. This preserves your work and returns you to exactly where you left off once the restart completes.

Mac: Using the keyboard shortcut

Press Control + Command + Power button (or Control + Command + Eject on older Macs). A dialog box will appear asking whether you want to restart, shut down, or log out. Click Restart and confirm. This method works when the Apple menu is not responding or when you need to restart quickly.

If your Mac is completely frozen and will not respond to keyboard commands, hold the power button for ten seconds until the screen goes black. Wait five seconds, then press the power button again to turn the machine back on. This is a hard reboot and should only be used when no other method works, because it can cause data loss if files were open when you forced the shutdown.

Linux: Restarting from the terminal

Open a terminal window. On most Linux distributions, you can do this by right-clicking on the desktop and selecting "Open Terminal," or by pressing Ctrl + Alt + T. Once the terminal is open, type the command sudo reboot and press Enter. The system will ask for your password if you are not logged in as the root user. Type your password and press Enter again.

The computer will shut down and restart automatically. The entire process takes one to three minutes. If you want to restart after a delay — for example, to give yourself time to save work — type sudo shutdown -r +5 to restart in five minutes, or replace the 5 with any number of minutes you prefer.

Hard reboot: When your computer will not respond

If your screen is frozen, your mouse and keyboard do not work, and you cannot access any menus, a hard reboot is your only option. Locate the power button on your computer — on desktops it is usually on the front panel, and on laptops it is typically on the side or keyboard. Press and hold the power button for at least ten seconds without releasing it. The screen will go black and the computer will power off completely.

Wait five to ten seconds for the system to fully shut down. Then press the power button once to turn the computer back on. The startup process will take longer than usual because the system will check the hard drive for errors — this is normal and necessary after a forced shutdown. A hard reboot can cause data loss if you had unsaved files open, so use this method only when the computer is completely unresponsive and no other restart method will work.

Frequently Asked Questions

Will rebooting delete my files or programs?

No. A reboot restarts the operating system but does not remove any files, programs, or settings from your computer. Any files you saved before the reboot will still be there after it completes. Unsaved work in open programs will be lost, which is why you should save your work before restarting whenever possible.

How long does a reboot usually take?

A typical reboot takes one to three minutes from the moment you click Restart until the desktop appears and the system is ready to use. Older computers or systems with many startup programs may take longer. The first reboot after a major operating system update can take five to ten minutes.

What is the difference between reboot, restart, and shutdown?

A reboot and a restart are the same thing — the computer powers off and turns back on. A shutdown powers the computer off completely and does not turn it back on automatically. You would use shutdown when you are done working for the day, and restart when you want to clear the system's memory but keep working.

Should I restart my computer regularly?

Restarting once a week or after installing major updates is generally a good practice. A reboot clears temporary files from memory, closes programs that may be using resources in the background, and applies any pending system updates. If your computer is running slowly, a reboot is often the first troubleshooting step to try.

What should I do if my computer will not restart?

If the restart command does not work, try a hard reboot by holding the power button for ten seconds. If the computer still will not turn back on, check that the power cable is plugged in securely and that the outlet has power. If the computer turns on but gets stuck on the startup screen, you may need to contact the manufacturer or a repair technician, as this can indicate a hardware or operating system problem.