Infinite sevens: MBR problems

[Peter Howell <pbh9545@garnet.acns.fsu.edu>]

	I've almost successfully installed the debian base on a pcmcia hard drive 
in a PC110.  I say almost because I can't get it to boot.  When I attempt 
to boot off the HD, I get the following message.

MBR

L 07  07  07  07  07 .....

and so on forever.  If I hold down space during boot, I get the MBR 1FA 
prompt, so presumably MBR is loading just fine.  If I attempt a '1' from 
there, I get the above output.  Booting off the floppy works fine.

AS a side note, if I move the drive to a different machine (Ricoh g1200s) 
the message is the same but I get infinite 4's.

Does anyone know what's going on here?  Could my kernal have been hosed?

Thanks

Peter