![Advisory: HP ProBook 645 G1 and HP ZBook Mobile Workstations - Intermittent System Fan (90B) Error During POST, Computer Shuts Down | HP® Support Advisory: HP ProBook 645 G1 and HP ZBook Mobile Workstations - Intermittent System Fan (90B) Error During POST, Computer Shuts Down | HP® Support](https://support.hp.com/wcc-assets/document/images/308/c05318861.jpg)
Advisory: HP ProBook 645 G1 and HP ZBook Mobile Workstations - Intermittent System Fan (90B) Error During POST, Computer Shuts Down | HP® Support
![Hp 90B fan error fixed ! The system has detected that a cooling fan is not operating correctly! #90b - YouTube Hp 90B fan error fixed ! The system has detected that a cooling fan is not operating correctly! #90b - YouTube](https://i.ytimg.com/vi/jkd3g_i0WfY/maxresdefault.jpg)
Hp 90B fan error fixed ! The system has detected that a cooling fan is not operating correctly! #90b - YouTube
![Why is my HP laptop showing "System Fan (90B)" error even after cleaning the fan with compressed air? - Super User Why is my HP laptop showing "System Fan (90B)" error even after cleaning the fan with compressed air? - Super User](https://i.stack.imgur.com/BfnNw.png)
Why is my HP laptop showing "System Fan (90B)" error even after cleaning the fan with compressed air? - Super User
![Why is my HP laptop showing "System Fan (90B)" error even after cleaning the fan with compressed air? - Super User Why is my HP laptop showing "System Fan (90B)" error even after cleaning the fan with compressed air? - Super User](https://i.stack.imgur.com/1kkP2.jpg)