Steps to Fix :
- Select the Apple menu in the upper left corner. From the menu, choose Force Quit. Force Quit the application by selecting it and pressing the Force Quit button. Another option is to right-click or control-click the app's icon in the Dock to Force Quit it. If it's not responding, you'll be able to Force Quit it.
- Even if you were able to Force Quit your problematic app, it's still worth rebooting your machine. to Restart a Mac That Isn't Working: Hold the power button down for a few seconds. If it doesn't work, hold down the Control and Command buttons while pressing the Power button.
- The initial cause of your Mac's slowness is usually out-of-date software. Here's how to see if your Mac is running the most recent version of OS X:
- Select System Preferences > Software Update from the Apple menu.
- You may check here to see if your Mac needs to be updated. To install an update, follow the on-screen instructions.
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