HP 8470p laptop error: "The system has detected that a cooling fan is not operating correctly"?

The system has detected that a cooling fan is not operating correctly.
Continued operation is not recommended and may cause unpredictable behavior that could result in random shutdown, data loss or possible system damage. The system will shut down in 15 seconds. To prevent shutdown and continue operation, press the Enter key now.
System Fan (90b)

Fix: watch video below