'Jump starting' Lite-eon Server Power Supply
For the PSU to 'start up' I assume I need to connect a certain combination of the small pins (that can be seen on photo 2) together (similar to how one 'jump starts' an ATX PSU


I don't think that assumption applies to cisco-specific server PSUs like yours. It's not unlikely that some of these pins supply a small supply voltage, large enough to enable a mainboard controller (BSC), which talks some proprietary digital protocol through some of these pins with the power supply. That expectation comes from the fact that some datacenter-grade hardware has access to sensors inside the power supply (to predict failure, for example), so there's some controller that does some data exchange with the mainboard anyway. Whether that's the case for your supply – hard to tell. But since server PSUs never needed to be turned on with a simple switch on the front side of the server case (many don't even have such a button!), it's likely your "short method" wasn't implemented.

Randomly shorting out pins sounds like a viable way of tripping fuses on a power supply, or even damaging it or yourself – that beast can supply 1100 W, and that will definitely make a small wire very, very, very hot very quickly. 

By the way, if you've never been in a server room – these things can (and this one will) be very loud. Really, not something I'd try to use for anything that's powering anything in a closed room, or not very loud, anyway (e.g. a CNC drill).