I am unable to reboot my computer with a bootable floppy made in DOS after I did FIPS partition of my hard disk. I have installed Red Hat 7.3 partition. How can I reboot. Do somebody have any idea. Thanks in advance.

You sure your BIOS is set to boot from floppy first? In theory you should be able to totally disconnect your harddrive and it could still boot from floppy. No matter how messed up your drive is, it should not interfere with booting from floppy.