Fan goes on from the startup and never stop!

Is that normal?
When I turned on my MBP fist in the morning, the temp was only 22 for CPU Core 1 and 22 for CPU Core 2. However, the fan went on from the startup. If the fan noise was silent and soft, I wouldn't complain, but it is so NOTICEABLE.
It makes "shhhhhhhhhhhhhh" sound "All The Time." I wonder if this is normal.
If you guys give me some advices or help, I would appriciate your help.
thanks...

> I do not have any ideas about resetting the PMU or SMC, Firmware updates.
Welcome to Mac's
My reply to you contained active links to the three items I mentioned might help fix your problem. If you move you mouse over the words Power management / SMC / Firmware it will turn into a hand and they will be underlined links, once clicked they will load a page of information in your browser on each topic.
If replies are helpful or solve your problem please mark them so and close the thread.

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