There is whirling sound when my macbook starts up

there is whirling sound when my macbook starts up

Sure! Not only your MBP dear gwforeman, everyone's does! Mine too, but without the disk in the drive. The hissing whirling sound starts sometimes at startup after the Mac's DING chime, sometimes when the MBP is up n' running and it starts in middle of nowhere. Seems something stuck in fan or MBP is protesting with a hissing sound that something is going wrong inside. Activity Monitor's report seems fine though.
No idea, what's going on.... Any buddy out there with a solution???

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