Trying to repurpose UCS m220 previously used for something else; can't see anything on the external monitor

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Hi guys

I have a couple of UCS m220 servers which used to work together in some sort of cluster
They were decommissioned and I am now trying to repurpose them
I have never touched an UCS before and I just started reading about is

Can anybody tell me how to reset these systems to factory default?

I have tried the common sense solution which was to connect a monitor to the rear side connector and an USB keyboard but nothing happened, even after I shortly plugged and unplugged the power cord of the device. 

The monitor stayed blank (it was setup to auto scan the input so no problem there) and the keyboard was not being powered up. I connected the keyboard to my laptop and it worked

I also tried the console (bot speeds 56700 115200 ) but I expect to hit a login prompt for which I have no passwd.

What do you guys recommend me to do ?

In a larger context, if I plan to use these just as servers with their internal HDD (SDD) do I need to learn UCS and all that? What would be a quick guide to get me off the ground?