What rebooting means and why you need to do it

A reboot is a complete shutdown and restart of your computer. When you reboot, your operating system closes all running programs, clears temporary memory, and starts fresh. This is different from putting your computer to sleep — sleep keeps power flowing to memory so you can wake up quickly, but a reboot powers everything down completely and rebuilds the system from the ground up.

Rebooting fixes many common problems: frozen screens, programs that won't close, internet that stops working, or a computer that has slowed to a crawl. When software gets stuck or memory fills up with temporary files, a reboot clears it all away. Most IT professionals recommend rebooting at least once a week, and when ready when something stops responding.

You should reboot before calling support for a technical problem — it solves roughly half of them without any other action on your part. If your computer is running slowly, a program keeps crashing, or your internet drops repeatedly, reboot first.

Key Takeaways

  • A reboot completely shuts down and restarts your computer, clearing temporary memory and closing all programs.
  • On Windows, use the Start menu and select Restart, or press Ctrl + Alt + Delete and choose Restart from the menu.
  • On Mac, click the Apple menu, select Shut Down, and check the "Reopen windows when logging back in" box to restore your open programs.
  • A reboot takes two to five minutes and solves freezing, slowness, and programs that won't close without any other troubleshooting.
  • Save your work before rebooting — all unsaved files will be lost when the computer shuts down.

How to reboot a Windows computer

The safest way to reboot Windows is through the Start menu. Click the Windows logo in the bottom left corner of your screen, then look for the power icon (a circle with a line at the top). Click it, and you will see three options: Sleep, Shut Down, and Restart. Select Restart. Your computer will close all open programs and begin the shutdown process.

If your computer is frozen and the Start menu won't open, use the keyboard shortcut. Press Ctrl + Alt + Delete at the same time. A menu will appear with several options. Look for "Sign out" at the bottom left, or in newer Windows versions, look for a power icon in the bottom right corner. Click it and select Restart.

If even that does not work and your computer is completely unresponsive, hold down the power button on the physical computer for ten seconds until the screen goes black. Wait thirty seconds, then press the power button once to turn it back on. This is a hard shutdown and should only be used when nothing else works — it can occasionally cause file damage if programs were writing data when you forced the shutdown.

How to reboot a Mac computer

On a Mac, click the Apple menu in the top left corner of your screen. You will see a dropdown menu. Select Shut Down (not Sleep). A dialog box will appear asking if you want to reopen windows when you log back in — check that box if you want your programs and browser tabs to return automatically after the restart. Click Shut Down.

Your Mac will close all programs and turn off. Wait about thirty seconds, then press the power button once to turn it back on. The computer will restart and, if you checked the box, will reopen the programs and windows you had open before.

If your Mac is frozen, press Command + Control + Power Button (or Command + Control + Eject on older Macs) to force a restart. If that does not work, hold down the power button for ten seconds until the screen goes black, wait thirty seconds, and press the power button again to turn it back on.

What to do before you reboot

Save all your work before rebooting. Any files you have open but not saved will be lost when the computer shuts down. Close your email, documents, spreadsheets, and browser tabs — or at least save them. Most modern programs will warn you if you try to close them with unsaved work, but it is safer to save manually first.

If you are in the middle of installing software or a system update, do not reboot until the installation finishes. Interrupting an installation can damage the program or the operating system itself. Wait for the installer to complete, then reboot if instructed to do so.

Tell anyone else using the computer that you are about to reboot. If someone else is logged in or has files open on a shared computer, rebooting will close their work too.

How long a reboot takes and what to expect

A typical reboot takes two to five minutes from the moment you select Restart until you see the login screen or desktop. Older computers or computers with many programs installed may take longer — up to ten minutes is still normal. Do not turn off the computer or press the power button again during this time, even if the screen seems stuck. The startup process has many stages, and interrupting it can cause problems.

During startup, you may see a black screen, a loading bar, or the Windows or Apple logo. This is normal. Once you see the login screen (on Windows) or the desktop (on Mac), the reboot is complete. Log back in if needed, and your computer is ready to use.

When to reboot versus when to call for help

Reboot first for freezing, slowness, internet problems, or a single program that will not close. These are almost always solved by a restart. If a problem returns when ready after rebooting, or if rebooting does not fix it, then the issue is likely something else — a hardware problem, a virus, or a software conflict that needs professional attention.

Do not reboot repeatedly hoping it will fix a persistent problem. If the same issue happens again within an hour of rebooting, write down what you were doing when it happened, and contact a technician or your computer manufacturer's support line. Repeated reboots waste time and can occasionally cause wear on your hard drive.

If your computer will not turn back on after a reboot, or if it gets stuck on the startup screen, do not keep pressing the power button. Unplug the computer, wait two minutes, plug it back in, and press the power button once. If it still will not start, contact support — this suggests a hardware or operating system problem that needs professional diagnosis.

Frequently Asked Questions

Is rebooting the same as shutting down?

No. Shutting down turns off your computer completely and leaves it off. Rebooting shuts down and then automatically turns the computer back on. A reboot clears memory and resets the system, while a shutdown just powers it off. For fixing problems, a reboot is usually better because it restarts everything fresh.

Will I lose my files if I reboot?

No, rebooting will not delete your files. All files saved to your hard drive will still be there after the restart. You will only lose work that was open in programs but not saved — so save your documents before rebooting.

Can I reboot while a program is installing?

No. If a program or operating system update is installing, wait for it to finish before rebooting. Interrupting an installation can damage the software or the operating system. If an installer seems stuck, wait at least ten minutes before deciding it has frozen.

What if my computer gets stuck on the startup screen after I reboot?

Wait at least five minutes — startup can be slow. If it is still stuck after that, hold the power button for ten seconds to force it off, wait two minutes, and turn it back on. If it gets stuck again, unplug the computer, wait two minutes, and plug it back in. Contact support if this keeps happening.

How often should I reboot my computer?

Rebooting once a week is a good routine for most people. If your computer is running slowly or you notice programs freezing, reboot when ready rather than waiting. Some people reboot daily; others reboot only when something goes wrong. There is no harm in rebooting frequently.