It is good for a computer's overall performance to reboot every once in a while. On a Windows machine, simply click the start menu, located in the left-hand corner of your screen, and then choose "Shutdown and then restart." Your computer will stop all applications, shut down, and then restart. To reboot the traditional way on a Mac operating system, click the apple icon, located on the top left-hand corner of your screen. Click "Restart" and your computer will stop applications, shut down, and restart.
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Quitting Frozen Applications
You may need to reboot because an application has frozen or the entire system has frozen. To do this on a Windows machine, simultaneously click "ctrl>alt>delete" and manually stop the application that is frozen. Once you have manually stopped the applications, you should be able to reboot the traditional way. If your computer is still not responding, you can click "ctrl>alt>delete" again and choose "Restart computer." On a Mac, you can manually stop running applications by clicking the apple icon and choosing "Force Quit." Select the application marked "Not Responding" and click "Force Quit." After the application quits, restart the traditional way.
If the previous methods of rebooting are still not working with your system, you can reboot your computer by manually turning off the computer, waiting 15 to 30 seconds, and then manually turning the computer back on. This is referred to as a last resort because you're likely to lose any information that has not been saved.