[scrlk]

You can see the male quick disconnect fittings for the liquid cooling at each corner of the server in this photo:

https://substackcdn.com/image/fetch/$s_!8aMm!,f_auto,q_auto:...

Looks like the power connector is in the centre. I'm not sure if backplane connectors are covered up by orange plugs?

[Romario77]

it's not the center one, it's the side ones. Center seems to be a power supply.