Floppy drive problem / "previous device boot failure"

[salmon_2]

I'm configuring a Compaq d220 microtower with windows 2000 server (it's a small lan). Everything's fine until I try booting from the floppy drive: I get the message "previous device boot failure" and the machine loads Windows. Then it's impossible to read any floppy from that drive. I changed it and the new one worked fine, but after a couple of reboot the same problem occurs again and I can't read *any* floppy, nor boot from the drive.
Booting from the CD drive even with a totally different OS doesn't allow me to use the floppy drive.
Funny thing: the first floppy drive works fine in another computer.
I'm stuck. HELP !
Thanks