Even though Mac and OS X have a reputation for being the best software and hardwarebination they still have normal issues. Whenever a Mac application misbehaves force quit can fix the problem. The only reason to use the force quit method is that your Mac doesn have sufficient RAM. As you run out of the memory space to utilize the app's resources the applications be unresponsive. In this situation the only plausible solution youll have is to force the close program on Mac to exit it. However the force quit will erase the work youve been doing in the application. But at least your device will start working. Use the following methods and try if your apps are also misbehaving 1. Use Apple Menu to Force Stop on Mac You can try out in such cases by using the Keyboard shortcut. The force quit Mac shortcut will instantly close the running app; you only have to follow the steps below Press the Command + Option + Escape key at the same time and the Force Quit window will appear on the screen. italic The Activity Monitor will appear on the screen and you will see the running applications on the screen. Choose the app which is misbehaving and click on the Force a process to quit option on the left side. italic Wait for a minute and then reboot the Mac normally. italic ordered-list If this method doesn work you can try disconnecting the Mac from the power supply manually.