Why does my macbook pro shut down when lid lift

my macbook pro starts and  shuts down, the sleep light blinks, the keyboard lites up, but cannot get os to remain on.  when i click on the powerbutton, the scrren goes black and nothing happens.  have tried most suggestions from apple and others, nothing seems to work.  the macbook pro was purchased june 2011.

thanks for the reply, i had tried your suggestions prior and no help, i did find out what was causing the trouble, i unhooked my power cord and the display came on, as soon as i reconnect the display went black, i pull the megncord off, and plug it iin after about 5 seconds and it works normal, will have to check my connection or possible faulty cord....

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