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Steps to Troubleshoot HP System Fan Error 90b
Step 1: Press Enter to clear the message and allow the system to boot to the Windows Desktop.
Step 2: Shut down your HP computer system and then inspect and clean the exterior vents to remove dust buildup by blowing air through the vent openings.
Step 3: After you remove the dust, turn on the computer. If the error message persists, continue with these steps.
Step 4: Perform a hard reset. So as via performing a hard reset can reset the recorded thermal values in memory and enable you to use your HP computer again.
Step 5: Have the computer serviced to clean internal components and replace the system fan if necessary.