Can't get net4501 to boot from CF

[My first post here - I've looked through the previous 6 months and don't 
see this as a topic]

I have been the fortunate recipient of a net4501, but although I've written 
a Compact Flash card image it doesn't boot, from the CF card, although the 
V1.23 BIOS appears to work.  I may not spend too long on this but could 
anyone point me to a known working image?  I used m0n0wall net45xx-1.236.img 
as a test, but eventually I might like to try NTP - just for interest.

To write the card I used the Windows program: Win32 Disk Imager

  http://sourceforge.net/projects/win32diskimager/

which has successfully written SD cards for booting Raspberry Pi PCs and I 
tried both a 128 MB and a 30 MB CF card.

Thanks,
David
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