Hi,
I get a vacuum cleaner to suck out the power supply fan. To clean out 
the case and the fans I take it down to my shop and
  remove the side panel on the case then blow it out with the air 
compressor. I do lower the air pressure before starting. Also you 
need to have a moisture filter in the line so as not to introduce any 
water in to the motherboard etc.
Max.

on 13:40 16/04/2009, Max Robinson said:
>Today I cleaned the dust out of my computer.  What a difference.  Here are
>the details.  The fans in my computer are temperature controlled.  When I
>turn on the computer they run at full speed and quickly slow down to a slow
>speed as the temperature sensor  becomes active.  I've had this computer for
>almost 5 years and as the air flow path became stopped with dust the fan
>started running faster.  This happened so gradually I wasn't aware of it.
>What started happening was that as the processor worked harder the fan would
>run faster.  So when I was recording sound or video the fan would run quite
>fast and when the recording was stopped the fan would slow down.  This had
>been going on for a long time but in the past couple of months had become
>more pronounced.  It finally penetrated my thick head that this didn't
>happen when the computer was new.  So today I disconnected everything from
>the back, set it on my bench and took off the side.  There were two fans I
>could get at.  There is a third one in the power supply but that case is pop
>riveted shut.  Of the two I could get at one is in the back blowing air out.
>The other is mounted to a finned heat radiator mounted on the processor.  I
>took that one off and found that the fins of the heat radiator were almost
>completely clogged with dust.  An old toothbrush was the perfect thing for
>cleaning out the fins.  There was a lot of dust in both fans so I cleaned
>that out too.    So it's all back together now.  When I record something I
>can't detect any speedup of the fans.  Also the air coming out of the back
>is a lot cooler than it was before the cleaning.  It's so nice to work here
>and not have to listen to those fans.  I didn't realize how bad it was until
>I got it fixed.     I would recommend cleanings more frequently than 5
>years.  Do as I say, not as I do.  Grin.
>
>Regards.
>
>Max.  K 4 O D S.
>
>Email: [email protected]
>
>Transistor site http://www.funwithtransistors.net
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>Music site: http://www.maxsmusicplace.com
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