The fan on my iMac now blowing very hard. Can I do about it?  Is it a sign of a future problem computer?

Suddenly, my iMac fan started blowing very hard. Is that what I can do about it? Is this a sign that my iMac is about to crash?

Try resetting the SMC reset management system (SCM) controller on your Mac - Apple Support

You may need to do 2 - 3 times and when you disconnect the power supply cable do to the back of the mac not the wall.

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