Lian Li PC-A58 Casehardnrg -
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You attach the PSU mounting plate to the PSU using standard 6-32 screws and then install the PSU from the outside-rear of the case and secure it in place using the knurled thumb-screws.
Is the PSU upside down? You may well ask that, but the mounting plate comes supplied this way round, and is like that in the illustations. Also the perforations in the left-hand side panel allow the PSU to take in fresh air from outside the case. So, I'd say it's fairly safe to say that this is the intended orientation of the PSU.
With the PSU in place, you can see the small gap left for air intake. Only 21mm, so it is slightly under the common recommendation of 1 inch (25.4mm).
Continuing on, the power cables can now be attached to the required power ports.
It probably would have been a better idea to attach the top panel before the PSU, as I had to unscrew the PSU and slide it back in order to plug the top fan into a motherboard fan header.
The USB/audio/Firewire cables can be attached if you wish to use the top access panel. I installed the USB and Firewire, but left the audio cable unconnected as I was using a Soundblaster Audigy2 ZS soundcard. However, for people using onboard audio, you will be interested to know that the audio cable has two header plugs, one for the AC97 standard, and one for HD Audio.
With everything installed, all that is left to do is put the side panels back on, and use the thumb-screws to keep them in place.
So that's the installation part complete. My intention of using an explicit step-by-step procedure is that hopefully now you have a good idea of how the installation goes with this case, the features it provides, and the limitations it imposes.