Power button works only intermittently

Hi there,
When I try to turn on my macbook pro, (bought in October of 2009),  it now takes several tries at times. For the first year and a half, I never had this issue.
A couple months back, it would only turn on if I unplugged devices connected via USB (external mouse, Internet stick) but at least then the computer would turn on, but not fully boot up.
Now, it sometimes doesn't turn on at all. My sense is that this is a separate issue. When it doesn't turn on, the little white light on the front right of the case comes on. I hold the power button down again, and there's a faint sound, and the light goes off. Sometimes, on the next try, the MBP will turn on, sometimes it takes 3 or more tries.
I'd take it to an apple store, but I'm in a small town in South India, and there are none nearby. I'm hoping to get some input before making a long treck to a bigger city so I can have it looked at.
Thank you!
Cheers,
Julian

i brought it to apple support and it turns out there was so much humidity in my room that that's what caused the problem. They opened it up, dried it out and it worked again.
I'm in Goa Indis right now, and it's monsoon season. Plus, I lived in a place right near the ocean. This is probably an unusual set of circumstances but I figured I'd add the solution in case somebody else ever runs into this.

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