How to Fix a Mac OS Crash

Press 'Command-Option-Esc' at the same time. The Force Quit Applications window opens, displaying all of the open applications, with 'Not Responding' beside the application that caused the Mac to freeze. If this window does not open, press 'Command-Option-Shift-Esc' for three seconds to force quit the unresponsive program. Then open the Force Quit Applications window.
Click any application that says 'Not Responding' and click 'Force Quit.'
Restart your computer if you have not shut it down in more than 24 hours. This will clear memory being held by any troublesome applications.
Click the 'Finder' in the Dock to open a new Finder window. Click 'Applications,' then the 'Utilities' folder. Double-click 'Activity Monitor.' This will show you what resources are being used by processes and applications.
Click the '%CPU' tab to sort this column. Processes and applications are now sorted in descending order. Processes using most of the Mac's CPU (Central Processing Unit) will be shown first.
Click the 'Real Memory' tab to see which processes and applications are using the most memory. Do the same for 'Virtual Memory.' Real memory is stored on the memory chips, while virtual memory is stored on the hard drive.
Close any application that is using an unusual amount of memory or percentage of the CPU. What is unusual for memory usage will depend on the programs you run, but anything over 700MB should be examined. Any process using more than 20 percent of the CPU for more than a second or two should be considered unusual.
Relaunch the application that caused the Mac to crash.
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