One would think that computers are not in need of regular maintenance, in fact they are. After some time in operations - months or years, any original lubricants are gone. Recently, SVBUG was gifted several servers that had seen their prime, but were still useful. A little Oil and Lube did the trick.
Here are a couple of Tutorials on :
How to Remove and Apply Thermal Compound By Jeremy Blum (aka sciguy14)
Quiet noisy computer fans with a drop of oil by Greg Shultz