I am having keyboard problems when trying to boot up an OS (bootcamp on Mac Mini Server)

I recently tried using bootcamp on my new Mac Mini Server.
I uploaded a windows ISO Image perfectly the way it asked, Windows 7, I followed the correct steps, euqally divided one of the hard drives, and I was ready to actually set up the new Windows section of my computer. During this booting session, my dog came in the room with her ball and knocked the computer plug out of the socket. Now when I turn on the mac, the fan still works, the same Macintosh sound comes up, the screen turns that usual very bright gray, but it stays on that gray. After a minute or two, the screen turns black, with a blinking underline, as if it were confused to choose which operating system it has to boot.
My problem here is that I use a wireless keyboard (not by Apple) -- and I suppose that bluetooth syncronizes with the OS and not the computer system itself -- so my keyboard commands do not get recognized in order for me to navigate into Windows 7 or OS X Mountain Lion. I tried solving this problem by purchasing a brand-new USB keyboard (since Mac Mini Servers do not have the PS/2 entrance). I guess this new USB keyboard didn't work, I imagine, either because the USB slots on the machine are not recognized by the computer's internal system, only by the Operating Sysytems (which I hope isn't true), or that the mac had never used that USB Keyboard and wasn't going to be capable of using it until it had installed the necessary drivers, but without the OS running that would become impossible.
So my question is: Is there a way that I can connect a keyboard to the mac so I can continue installing my alternate Operating System? Is it maybe another problem all together?

It is starting to sound more like Bootcamp failed to install properly.
Have a look at > Boot Camp 5: Frequently asked questions
then perhaps > Failed bootcamp instlation - Google Search

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