Mine did not have the big green fan in back. Rest of the disassembly was similar, until I got to actually removing the PCB from the metal back plate. This says to simply slide it forward while holding the plate in place. Yeah… well, in theory. It actually took a fair amount of gentle prying to get the PCB to slide forward. The key is the little metal grounding clips in the corners. The fingers do not actually present much pressure. However, the vertical metal to which they press is an overhang. So the trick is to gently FORCE the PCB forward at each rear corner until such time as the overhang no longer exists. At this point the vertical metal tab will be full back against their respective slots. The PCB will simply lift out then.

In mine, the power supply was much longer due to a fan located on the front end. Same basic disassembly, however. There was a green tab at the front and it was difficult, but the power supply (with effort) did slide forward and out.