There's also a slideshow at the bottom if that'll help you better. (:
It starts out looking like this.
You start by taking apart the easy pieces at the top,
like this fan we're taking out.
Then you want to take out the power supply, which is this.
<<<<<<<<<<<<<<<<<
After that disconnect any wires that you can, make sure to take pictures so you
remember where they go when you're putting the CPU back together.
remember where they go when you're putting the CPU back together.
Then you can start taking out the simple things like the floppy disk drive, the CD drive, RAM, etc.
Finally you can work on taking out the motherboard.
Which is very easy, just a few screws to unscrew and you're done!