Case Study 1 - Dust

Dust slows your PC, shortens component life, causes crashes and increases noise.

Dust is a common problem in desktop computers and can cause serious problems.

Computers rely on airflow to cool internal components. For this reason, air is sucked into the case and expelled through the power supply fan and usually a case fan as well. This airflow makes the computer vulnerable to dust build-up.

Power Supply Unit

The photographs below show a typical 2-3 year old PC which has been submitted to the Paisley PC Doctor for a Service. The photos show before/after cleaning.

Before After
Power supply- caked in dust Power supply- dust removed

Power supply: The power supply is one of the main heat producing components inside your PC and a large amount of air is ‘sucked’ through it to keep things cool. Dust restricts airflow but also forms a ‘blanket’ over components, keeping them dangerously warm.


Processor: This is definitely the hottest part of your PC- and possibly the most expensive! The processor is your computers ‘brain’ and works very hard. It needs a dedicated cooling system (heatsink and fan). Without the heatsink and fan, the processor would smoke and burn out in just a couple of minutes!

Before After
CPU cooler- caked in dust CPU cooler- dust removed


The heatsink is basically a large chunk of metal which conducts the heat away from the processor. It is designed to have a large surface area (usually lots of thin fins) to help dissipate the heat to the surrounding air. A fan is mounted on top, blowing cool air over the fins.

Here you can see (pictures below) that the fins on the heatsink have been completely covered with dust, completely cutting off the airflow fan. NOT GOOD!! This makes the heatsink hundreds of times less efficient at cooling the processor. This can lead to random crashes and ultimately- complete processor failure.
Before After
Heatsink fins- Blocked with dust Heatsink fins- dust removed


Some computers vary the fan speed, depending on the processor temperature. This reduces noise when the processor isn’t particularly hot. If you notice the fan is constantly on the high speed setting, chances are good that the fan is clogged with dust.

Before After
CPU fan- caked in dust CPU fan- dust removed
The fan itself is also caked in dust- it needs cleaned and re-lubricated.

Call the Paisley PC Doctor to arrange for your PC to get a service. A standard service includes an internal cleanup as well as a comprehensive cleanup and update of your windows installation. It will leave your computer running better than it ever has before!

WARNING: Never attempt to brush or vacuum inside your PC- this causes a build up of static electricity which can kill sensitive components (memory, processor and motherboard). Dust must be removed with compressed air. Any brushing must be done with special Electrostatically conductive tools to avoid static electricity build-up.