A lot of computer problems start with a dirty computer.
You should clean inside often, this will save you money
in the long term. The build up of dirt causes overheating.
It is easy to open a computer, usually only requiring two
screws to be removed, then slide it off. Make sure that
you have unplugged it from the electricity before you
begin.
If you do decide to do this, mark cables that you unplug
from fans, these are the only things that you will need
to remove. You will probably find that the cables will
only reach the fan that you have removed.
Use a clean dry half inch paint brush and a vacuum
cleaner, but don't touch anything with the vacuum.
Here are some examples of a dirty computer.

Main and CPU Fans Removed

Main Power Supply

Inside Power Supply

You should clean inside often, this will save you money
in the long term. The build up of dirt causes overheating.
It is easy to open a computer, usually only requiring two
screws to be removed, then slide it off. Make sure that
you have unplugged it from the electricity before you
begin.
If you do decide to do this, mark cables that you unplug
from fans, these are the only things that you will need
to remove. You will probably find that the cables will
only reach the fan that you have removed.
Use a clean dry half inch paint brush and a vacuum
cleaner, but don't touch anything with the vacuum.
Here are some examples of a dirty computer.

Main and CPU Fans Removed

Main Power Supply

Inside Power Supply
