When i turned on my notebook a message indicated that a system fan (90b) was not operating correctly

When I turn on my HP Pavilion G7 - running Windows 7 -  notebook an error screen comes on saying that a system fan is not working with what seems like an error code of 90B.  I can continue through to startup normally, but the message indicates that it may cause malfunctions to do so.  How do I resolve this problem?

Try to use a can of compressed air in the reverse direction of the normal air flow with the computer off. A dust/lint/hair matt can accumulate on the inside of the heatsink near the fan blades. 
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