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You can now slide in the power supply, secure it with four screws on that bracket. If you look at the left side cage, you'll already have noticed an SSD was installed.
For SSDs it simply uses the four spacer screws and mount it. Once HDDs can be installed, which has special rubberized screws. We, however, are not mounting an HDD today.
You can now start your wiring, connect the PSU and power/reset/led cables etc. There are grommet holes at a strategioc location, for example, the 4/8pin power cable you can lead through a whole. As stated, I would have liked to have seen rubberized inserts here for a bit better aesthetic feel.