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Why is my HP laptop showing "System Fan (90B)" error even after cleaning the fan with compressed air? - Super User
If I don't feel any air coming out of my laptop's ventilator, but I can hear the fan slightly, is it broken? - Quora
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Replacement CPU Cooling Fan for HP 250 G4 255 G4 Notebook 15-AC Series DC28000GAR0, 4-Pin 4-Wire SPS 813946-001
![FIXED - The system has detected that a cooling fan is not operating correctly || System Fan (90B) - YouTube FIXED - The system has detected that a cooling fan is not operating correctly || System Fan (90B) - YouTube](https://i.ytimg.com/vi/H03gzUTJqwg/maxresdefault.jpg)