Help!

My 1.3a installation has been running for several weeks but
now refuses to boot.

When the RiscBSD BootLoader attempts to boot, the screen goes black,
then back to grey with a pointer - nothing else.  I have to reset 
the machine.

Any ideas?

John
-- 
John Wilson 
http://www.jwok.demon.co.uk
from a StrongARM powered Acorn Risc PC