Amaya Toman Stuck Application: Forced application termination
If your Mac freezes while using an app, try to see if you can force quit the app you're using. The problem may be specific to one application rather than the Mac in general, and sometimes closing that application can solve the problem. To force quit an application, click in the upper-left corner of your Mac screen menu -> Force termination. In the window that appears, select the appropriate application and click on Force termination.
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Stuck keyboard or mouse: Reset Mac without keyboard and mouse
If you can't move the cursor or use the keyboard, you can't force quit or perform any of the other actions. In this case, you may need to restart your Mac. If your mouse and keyboard really don't work, the only solution is to "hard" shut down your Mac by long-pressing the power button, waiting a while, and then trying to restart it. If you are using an external mouse and keyboard, check that both devices are sufficiently charged.
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Pavel Jelic Stuck notifications: Reset notifications
Stuck notifications that won't go away from the Notification Center in the upper right corner of your Mac's screen may not affect your computer's performance, but they can be pretty annoying. If you want to get rid of them, launch Activity Monitor on your Mac, enter the term in the search field "Notification Center", after finding the appropriate process, mark its name by clicking, and then force its termination by clicking on the cross at the top of the Activity Monitor window.
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Stuck Downloads: Fixed slow file saving
Are you downloading a file from the Internet, or are you saving a new document, for example, and the saving has slowed down significantly? This can also happen to you when you work with Mac. If you want to solve the problem of extremely slow content saving on Mac, launch the Finder and in the bar at the top of the screen click Open -> Open folder. Enter the path in the text box ~/Library/Preferences/com.apple.finder.plist, press Enter, and move the marked file to the trash. Next, head to the top left window of your Mac screen, click on menu -> Force Quit, select Finder in the application list window and click Restart.
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Copy Stuck: Fixed a copy and paste issue
Having trouble copying and pasting on your Mac? Even in this case, there is a relatively easy remedy. Run again Activity monitor and then enter an expression in the text box board. Once you see the relevant process, click to mark it and click the cross at the top of the Activity Monitor window. Choose Force termination and try to go back to copy and paste.
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