Unplug the computer. Remove the case. Touch the case frame to  avoid
static problems.
Try to work your way from top to bottom, blowing the accumulated debris
out of the case. There's nothing you can hurt with compressed air. Pay
special to fans and fan blades. I have found it necessary sometimes to
use Q Tips to clean fan blades. I also blow inside USB and other ports.
In bad cases, I remove all the wires and take the computer outside, then
blast everything I can see with canned air. I have a vacuum, but it's
not good for much. Too slow and not enough suction.
Your computer will thank you.

Donna Parsons wrote:

>I recently bought a Kensington Desktop Vacuum to  use on my desktop computing
>equipment.  The instructions that came with it  only talk about proper
>maintenance of the vacuum and not much about how I can  safely use it with my
>computer equipment or WHICH equipment.
>
>I also  bought a can of Memorex Air Duster and again, no instructions on what
>equipment  I can safely clean with it or how.
>
>I look inside my computer and see that the insides really have a  buildup of
>dust, but I don't want to do anything harmful.   Any  direction on using
>either of these two products would be greatly appreciated or  any tips of caution.
>  I've had computers for years, but  have never attempted to clean one, more
>than just dusting with a soft cloth on  the outside.
>
>Thank you in advance for any info that may be provided.
>
>Donna Parsons
>
>        The NOSPIN Group has added a new feature on our website,
>           web based bulletinboard for questions and answers:
>              Visit our sister website at http://nospin.com
>
>
>

        The NOSPIN Group has added a new feature on our website,
           web based bulletinboard for questions and answers:
              Visit our sister website at http://nospin.com