My macbook pro will not start after pressing the power button

I have bought a macbook pro last year and now, I have a great problem since a few months.
My macbook does not boot up, I hear no fan noices and no LED lights are blinking...
Battey is full, but nothing happens (means system will not start up).
I have also tried to start with the Power button - but the similar effect "NOTHING HAPENS".
What I don't understand is, if I do nothing for one or two days and press then the power button, the system will start up and full functionality for a few days.
And anytime I get the same problem again... and must wait also for a few days.
Can anybody support me please.
Thank you all in advance and looking forward to a fast reply.

Try reseting SMU as suggested in link below
http://support.apple.com/kb/ht3964
Allan

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