start-up

[norman]

I rarely need to boot my computer but, when I do, I get the following
message just before booting proper starts:- Invalid system disk. Replace
the disk and then press any key. I just press any key and off we go. I
am running 7.04 which I upgraded from 6.10 by following the
instructions. Just curious to know what would cause this message and, if
not significant, how do I get rid of it?

Norman