I have an HP ze4100 and it does have them same
LOUD fan aswell.. Looks like most if not all HP lappies have this defect.
What makes mine a bit quieter is that i got a " Notebook Cooling Pad " by Evercool and it does make thing much quieter.
Prior to getting the pad, the fan was almost on at all times...
After the pad, it only goes on when the cpu is at heavy loads...
Makes alot of diffrence indeed, also the quietness has alot to do with you enviroment temps.. as a matter of fact, the fan its no even on right now as we speak..
It worked for me, could work for you too.
