Question When I turn my pc off the cpu fan and gpu fan spin and stop spinning and spin again

Jan 2, 2022
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Basically previously my ram exploded so I got a new motherboard so afterwards the ram slot on the one I got wasn’t working so this time I got a new motherboard b460m-plus tuf gaming Lga 1200 whenever I turn my pc off the cpu fans spin for 3 seconds and turns off and etc and same with the gpu what could be the problem now bc I’m tired
 

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