HP Support > HP Compaq nx9600 Notebook PC > Main Support page > Manuals > Service and maintenance information,http://h20000.www2.hp.com/bizsupport/TechSupport/DocumentIndex.jsp?contentType=SupportManual&lang=en&cc=us&docIndexId=64179&taskId=101&prodTypeId=321957&prodSeriesId=445351#2
Under the bold black subheading - Service and maintenance information, click on -
Compaq Presario X6000 and Compaq Presario nx9600 Notebook PC - Maintenance and Service Guide
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If you do not know, and wish to; post back in a Comment.
The Base Enclosure (Bottom Cover) does not come off.
You have to completely disassemble the laptop, all the way down to the Base Enclosure; from the Top.
The Processor, and Heatsink/Fan Assembly is on the Bottom of the motherboard.
Bottom view of motherboard,http://www.ebay.com/itm/NEW-377209-001-HP-COMPAQ-SYSTEMBOARD-for-HP-NX9600-Mainboard-Motherboard-/251249346276?pt=Motherboards&hash=item3a7fa0c6e4
Wear an ESD wrist strap, and have the alligator clip attached to a good ground source.
Average cost is $3 to $6.
(Electro Static Discharge)
Break any of the motherboard ZIF connectors, and this means MOTHERBOARD REPLACEMENT.
(i.e, Keyboard Cable motherboard connector, Touchpad Cable motherboard connector, etc)
Need step by step guidance in disassembling, post back in a Comment.