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Not all cases come with a Power Supply fitted - if yours does, then you can skip this article.

Four screws hold the PSU to the rear of the case, the screw holes are pointed to in the image on the left. These screw holes are positioned so that the PSU will only fit in one way - so if the screw holes in the PSU cannot be seen from the rear of the case, turn the PSU up the other way...

Access to the PSU is easier in some cases than others - this one is quite easy, especially as nothing else has been fitted yet.

Position the PSU above the support lip (if present) and offer up to the rear of the case.

Position the PSU so the screw holes align with the holes in the case.

While holding the PSU in place, screw in the four screws a few turns by hand. The screws will be in the pack of parts that comes with your case. Use the screws with the coarser thread, which should screw in easily.

Finally, tighten the screws with the screwdriver - remember not to over-tighten, otherwise you'll strip the threads in the thin metal of the PSU.