Starting my mac book pro, PROBLEM...

Hello there!
When i start my macbook pro with a short click on the start button it begins to work for 2 sec. then interrupts and it's out again. Only by long clicking on the start button i can start mac OS X or vista...
Is this a problem of the firmware because i remeber i had to make a long click during the update of my firmware half a year ago.... but this problem exists since yesterday...
can anybody help me?

Glad it worked.
Why did it happen? Lots of things can cause the SMC (which manages power in the system) to become corrupted...you might try to remember what you did between the last time it worked normally and when you noticed the problem.
Check the console logs, there may be a clue there.
At least now if it happens again you have an easy way to correct it.

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