If purchasing a used or new Xeon computer, Keep in mind though, while I'm not sure about DELL or other manufactured prebuilds, as I build mine. The fans in them can get quite loud, especially the older variant and also can heat a room, so ideally may need a dedicated AC for that room. The newer ones however runs much more quieter, except during POST and if it starts to get too warm. Another thing to keep in mind, newer Xeons machine may take a while to boot up. I only have experience with MP Xeons, so single Xeons may not get loud at all. Some Xeons machine should have an IPMI feature using an Ethernet port, which should allow for powering on the server and even make changes to BIOS settings remotely. You should be able to install Windows or whatever OS remotely.
For info about IPMI
For info about IPMI
