IBM 6828 Blank Screen flashing Cursor

Hi There!

I am trying to put an image down onto a bunch of IBM 6826
machines, and strangely a few of them worked, but now when
we throw an image down on them, they give a black screen
with a flashing cursor
and it won't boot. I have tried fixmbr, and fixboot,
changing boot orders, and other zen boot cd.

We are running 7.01.60706 on netware 6.5.7