Problem with processor fan.

Hi, since a few days ago the processor fan is not starting when I turn on the laptop, it just starts when I open any windows user session, it used to work fine, suddenly changed and I don't know how to fix it, also when Is not in "High performance" mode the fan just doesn't start till I go to energy options REactive the "Max performance" option in cooling  mode... I'm sorry for my poor explanation, my english is not very good, but I hope is enough to get a little help.
Thanks.

The fans on laptop computers are thermostatically controlled so they don't turn on when the computer is first turned on. "Thermostatically controlled" is a fancy way of saying that the fans are turned on and off by the heat of the computer. Once the computer gets hot enough the fans turn on. This is a power saving feature to help save on battery power. When the computer's power setting is set for Performance, power is no longer a problem and the fan will come on more quickly and frequently. I have seen where the Bios has been changed to change the fan's heat settings, so you may want to make sure that you have the latest Bios. If the computer is not getting too hot or shutting down because of heat problems, I would not worry about the fan not turning on at startup.

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