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Dec 25, 2013 11:54 AM in response to liuxin94by dominic23,Press command + option + esc keys on the key board.
In the resulting window, click the "Force Quit" button.
http://support.apple.com/kb/HT3411
A new Mac comes with 90 days of free tech support from AppleCare.
AppleCare: 1-800-275-2273
Call AppleCare.
Best.