This sounds to me like the hard drive you exchanged out is not bootable
(being the Invalid System Disk) it says to remove disk and press any key to
continue because it isn't differentiating between a removable disk and a
non-removable disk.  If you were to boot off of a floppy disk and check if
the system files were on that Hard Drive, you would probably find that they
are not.  It is also possible that the newly put in Hard Drive had gone bad
as well.
Matthew Ballard
Computer Consultant

At 11:13 PM 2/20/00 -0800, you wrote:
>        I have a strange problem.  I have an old 486-100.  I was changing
out the
>hard drives in it and when I went to reboot I got this error message:
>
>        "Invalid system disk. Remove disk and press any key to continue."
>
>        The only problem is.......there isn't any disk in the floppy drive.
>
>        The computer and I have argued extensively over this.  I keep
telling it
>there IS NO DISK IN THERE!!
>
>        And the computer answers back, "Yes there is.....Invalid system disk.
>Remove disk and press any key to continue."
>
>        We seem to be at an impasse.
>
>        Anybody encountered this problem before?
>
>
>        Doug White
>
>                         PCBUILD's List Owner's:
>                      Bob Wright<[log in to unmask]>
>                       Drew Dunn<[log in to unmask]>
>
>

                         PCBUILD's List Owner's:
                      Bob Wright<[log in to unmask]>
                       Drew Dunn<[log in to unmask]>