Macbook Pro wont turn on - sometimes

I have mid-2009, 13 inch Macbook Pro. Recently I am noticing trouble. Once in a while when I put it to sleep by closing the lid, the light stays lit (which is suppose to go on and off indicating sleep). And when I open the lid, there is nothing on the screen and the light goes away. I close the lid, again the light lits up and stays up. So the macbook wont turn on.
Does anyone have any idea why is this? I sometimes keep the power button pressed for 5-6 seconds and force shutdown and boot again and then it works. Is it a good idea? is there any other way in these situation?
Is there something wrong in the hardware?
Please help ...

Sachadon,
Welcome to Apple Discussions.
When you try to wake your computer when opening the lid have you tried tapping one of the keys on the keyboard to wake it?
If that does not work then try doing a SMC reset follow these instructions.
SMC RESET
It is possible you are having hardware problems with the lid sensor but let try some other steps first.
Regards,
Roger

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