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Advisory: HP ProBook 645 G1 and HP ZBook Mobile Workstations - Intermittent System Fan (90B) Error During POST, Computer Shuts Down | HP® Customer Support
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System Fan (90B) The system has detected that a cooling fan is not operating correctly, HP, Compaq - YouTube
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Why is my HP laptop showing "System Fan (90B)" error even after cleaning the fan with compressed air? - Super User
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HP 8470p laptop error: "The system has detected that a cooling fan is not operating correctly"? – IT System Administrator Tuts
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