mac book pro 13' late 2011

Hi,

My mac book pro 13' late 2011 isn't starting up. It once started shutting down and rebooting by itself after 6 months of purchase but got ok by itself so I didnt go get it checked ( assumed it was a one off something ). Too bad but it was a problem to be resolved. Now, 20 days back same thing switching on and off started happening automatically and now the computer is not starting at all. When i press the power button it tries to boot ( gives a small kick after 2 seconds of the button press ) but nothing really happens. Could someoone please guide me if there is something that cane be done ? Thanks a lot in advance.