Does the server have a setup for remote console routing? Many server motherboard BIOS's contain an option for putting the console output to the serial port.
What I have done in the past is simply cross-link all the servers serial ports (COM1/server1 to COM2/server2, COM1/server2 to COM2/server3...) so I can remote boot and install the OS and all pertinent software. I just connect to the server that is the console and comm to the server needing installation.
Does not work for Windows, but should work for any UNIX.