You are attempting to replace the heatsink on an HP Compaq business desktop and from the
processor. Which step should you take to ensure proper heatsink removal?

A.
Shut down the system for 10 minutes to let the processor cool.

B.
Run the system for 10 minutes to let the processor heat up.

C.
Remove the system board before removing the heatsink

D.
Remove the power supply before removing the heatsink.

Explanation:
http://www.ehow.com/how_8046678_can-upgrade-processor.html (tips and warnings)