In a Phoenix bios, select boot from CD by going to where it now says C-then-A, the plus or minus keys let you cycle through the various combinations
this sounds like a not very new server you are trying to make into a home PC?
does it have ANY system on it now?
You cannot installl an PS from floppies, the days of floppy-sized OSs area gone... but you can use an MSDos floppy to start the machine (or even an old Win98 startup disk) to give you CD support to let you install an OS from there.
don't reset the bios, just go through and set whatever you can to AUTO, so it will correctly detect what you have.
this is a bit tricky but...install a web browser into a folder and burn it to a CD.....a small one like FIrefox better than IE.
then download this, install to a folder and also burn it to the CD
http://www.belarc.com/free_download.html
this is a browser based analyser that will tell you all serials, product keys, part numbers, chipsets etc in your computer. Then you (and maybe we here) know what machine you are dealing with, and can look up Dell site for details.
you could make a bootable CD if your burner software lets you and do it from that.
answer us plse with more details what OS you thinking of?