Hi,
Take a look at these two articles, may help you reduce the fan noise.
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c01871972
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=c02002364
Thank You!
__________________________________________
Was the post useful? Click on the white KUDOS! Star.
For product specific Guided Troubleshooting visit; http://www.hp.com/support/hpgt
Click here to know, How to use HP Guided Troubleshooting?
I am a HP employee