Picture of Disassembling and Cleaning Xbox-360 Power Supply ( Brick )
In this Instructable I'll show you how to properly dissassemble your ( or somebody else's :P ) Xbox 360 PSU. 

If all you want to do is get rid of the dust in it, I would simply recommend blowing compressed air through the vent holes. 
There could be issues with heat due to little, or bad thermal paste, this will show you how to get to it.

The tools you'll need are a No.2 Phillips, and perhaps a No.1.
Something narrow with a sharp point, preferably strong enough to put a fair amount of force into. I used a hunting knife.

A small screwdriver, or toothpick for applying new thermal paste, or reusing thermal paste.

Step 1: The feet

Picture of The feet
The first step in dissasembling you power brick is to remove the rubber feet on the bottom. These will pop out fairly easily, and can probably be taken out with your fingers.

I don't think I 'Need' to say this, but make sure the power brick is Unplugged before servicing it. 

Once the rubber feet are removed you will see a small plastic insert where each foot came out of. This insert can be pried out by pushing a blade between its edge and the power supply, and prying it up. 
I ruined my first one by trying to use the good ol' dental pick, but I found that this hunting knife worked far better, and kept them in a reusable state. 
ejonesss3 months ago

as with all power supplies there are high voltages inside so make sure you have unplugged and and waited a minute for the filter capacitors to discharge before attempting to open up the power supply.

safety is the first thing that should be observed

BradleyF17 months ago

Excellent effort on the instructions man. love the case for your xbox too! :D

Gunzo_Records11 months ago

On my model, there is no single screw hidden down between the light and the output cord. How would I remove the plastic shell?