The fastest way to restart depends on what you need

A restart clears your computer's memory, closes all programs, and reloads Windows or macOS from scratch. Most of the time, a restart fixes freezing, slow performance, and programs that won't close. You can restart through the Start menu in about 10 seconds, or use a keyboard shortcut if your mouse isn't responding. A forced restart — holding the power button — should only happen when nothing else works, because it can damage files.

The method you choose depends on whether your computer is responding. If it's working normally, use the menu or keyboard shortcut. If it's frozen, try the keyboard shortcut first. Only use the power button if the keyboard doesn't work either.

Key Takeaways

  • On Windows, click the Start button, select Power, then Restart — the whole process takes under a minute.
  • On Mac, press Command + Control + Power to restart when ready, or use the Apple menu for a gentler shutdown first.
  • If your computer is frozen, try Alt + F4 to close the stuck program before restarting the whole machine.
  • Holding the power button forces a restart but can corrupt files, so use it only when the keyboard and mouse both fail.
  • After restarting, wait 30 seconds before opening programs again — your computer needs time to finish loading.

Restarting Windows through the Start menu

Click the Start button in the bottom left corner of your screen. A menu will open. Look for the Power button icon — it looks like a circle with a line at the top. Click it.

Three options will appear: 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), and then the screen will go black. Windows will load again, and you'll see the login screen after about 30 to 60 seconds.

If you have unsaved documents open, Windows will ask you to save them before restarting. If you click Restart without saving, you will lose that work.

Restarting Windows with a keyboard shortcut

If your mouse isn't working or you want to restart faster, use this keyboard shortcut: press Alt + F4. This closes the current program. If no program is open (you're looking at the desktop), a shutdown menu will appear.

From that menu, press the down arrow key once, then press Enter. This selects Restart. Your computer will restart the same way as using the Start menu.

Alternatively, press Windows key + X to open a quick menu, then press U twice. The first U selects Shut down or sign out, and the second U selects Restart.

Restarting a Mac

On a Mac, the fastest restart is Command + Control + Power. Hold all three keys at the same time for about two seconds. Your Mac will restart when ready without asking you to save — so save your work first if you have unsaved documents open.

If you want a gentler restart that gives you a chance to save, click the Apple menu in the top left corner, then click Restart. A dialog box will appear asking if you want to save changes to open documents. Click Save or Don't Save for each one, then your Mac will restart.

After you click Restart from the Apple menu, your Mac will close all programs and restart. This takes about 30 to 60 seconds, the same as Windows.

What to do if your computer is completely frozen

If your screen is frozen and nothing responds to your mouse or keyboard, try this first: press Ctrl + Alt + Delete on Windows or Command + Option + Escape on Mac. This opens the task manager (Windows) or force quit menu (Mac), which lets you close just the frozen program instead of restarting everything.

On Windows, the Task Manager window will open. Look for the program that says "Not responding" next to its name. Click it once to select it, then click the End Task button at the bottom right. The program will close, and you can go back to work.

On Mac, the Force Quit window will open. Click the frozen program name, then click Force Quit. The program will close when ready.

If the task manager or force quit menu doesn't open, or if closing the program doesn't unfreeze your computer, then restart using the keyboard shortcut described above. If even the keyboard doesn't respond, hold the power button for 10 seconds until the screen goes black, wait 10 seconds, then press the power button again to turn it back on.

Why you should avoid holding the power button

Holding the power button forces your computer to shut down without closing programs properly. This is called a hard shutdown. Windows and Mac both need time to close files safely, and a hard shutdown skips that step.

A hard shutdown can corrupt files you were working on, damage your hard drive, or cause Windows or macOS to fail to load the next time you turn on your computer. Use it only when your keyboard and mouse both fail to respond — not as a regular restart method.

If you find yourself needing to force restart more than once a week, your computer may have a deeper problem. Overheating, a failing hard drive, or malware can all cause freezing. If restarts stop working, take your computer to a repair shop.

What happens during a restart

When you restart, your computer closes every open program and clears the memory (called RAM). This is why a restart fixes most performance problems — programs that were using too much memory are gone, and Windows or macOS loads fresh.

Your files and settings stay on your hard drive and come back after the restart. Nothing is deleted. The restart just reloads everything from the beginning, the way it does when you first turn on your computer.

A restart usually takes 30 to 90 seconds from the moment you click Restart until you see the login screen. Older computers or computers with a lot of programs installed may take longer. Don't turn off the power during this time — let the restart finish on its own.

Frequently Asked Questions

Will I lose my work if I restart?

You will lose any work you haven't saved. Before restarting, save all open documents. If you click Restart and have unsaved work, Windows or Mac will ask you to save it first. If you force restart by holding the power button, you will lose unsaved work without a warning.

How long does a restart take?

A normal restart takes 30 to 90 seconds from the moment you click Restart until you see the login screen. Older computers, computers with many programs, or computers with a full hard drive may take longer. If your restart takes more than three minutes, your computer may have a problem.

Is it bad to restart my computer often?

No. Restarting once a week or even once a day is normal and healthy for your computer. It clears memory, closes programs that are using resources, and keeps your system running smoothly. Restarting more than once a day suggests a problem that needs fixing.

What's the difference between restart, shutdown, and sleep?

Shutdown turns off your computer completely. Restart shuts down and then turns back on automatically. Sleep puts your computer in a low-power state but keeps it on — you can wake it by moving the mouse or pressing a key. Use restart to fix problems, shutdown when you're done for the day, and sleep when you'll be back in a few minutes.

Can I restart my computer while it's updating?

No. If Windows or macOS is installing an update, let it finish before restarting. Restarting during an update can corrupt the update and damage your operating system. If an update seems stuck, wait at least 30 minutes before assuming it's frozen.