The day which I fail to open a CPU

I am not a PC enthusiast, but I do build my own rig and I have helped to fix up one or two more computers for friends. But yesterday is my first attempt at opening at a DELL PC – Dimension 8300 (battery is flat, so I am changing it). So I proceed to try to open up the casing. Thinking it was like this.

  

10 minutes later I was still struggling to open it up.

And then finally, it opened!

%@!5#$*@ !!!

DELL. What a design!