My mac goes to sleep and when i turn it on again the screen just blinks

first time it happened, i closed my macbook's lid and when i was about to use it i clicked the power button but the screen just blinked. i tried to click the trackpad and it just blinked again. After that, i tried to force it to shut down. force shut down didn't work until after a few tries and all the while the screen just blinked everytime i tried to press the power button.
It has happened three times since. what should i do?

You may try the procedures in this support article.  I suspect a trip to the Apple genius bar will be the best option.  You probably have some hardware issues, such as the display or the GPU and the technicians will be to make to make a definitive determination.
http://support.apple.com/kb/ts2570
Ciao.

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