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![How to Test a Laptop's Cooling Fan [HP G42 – error 90B] | instantfix](https://instantfix.files.wordpress.com/2012/08/20120818_173858.jpg "How to Test a Laptop's Cooling Fan [HP G42 – error 90B] | instantfix")
How to Test a Laptop's Cooling Fan [HP G42 – error 90B] | instantfix
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How To Test Laptop Fans [3 Easy Methods] | DeviceTests
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FIXED - The system has detected that a cooling fan is not operating correctly || System Fan (90B) - YouTube
