LTSP woes with Lucid Lynx

[Andrew]

Dear All,

I am posting this here in the hope that someone may be able to offer
some suggestions, or, even better, some nuggets of insight, to help me
out of this hole here I've got myself into ...

In summary, I've installed ltsp-server-standalone in a fresh install of
10.04, built the client environment, and configured dhcp as I would have
done for 8.04 [which used to work perfectly]. lts.conf and the pxelinux
boot options are defaulted. My thin clients [old PIIIs with no discs and
with PXE cards] find the server no problem, download the kernel without
a hitch, but then blank screen when attempting to boot up. No login
screen, no splash, no nothing ;-( The keyboard is still 'responsive' [I
can do Ctrl-Alt-F keys] but other than that I have a totally blank
screen forever.

My journey to date is documented here:

http://ubuntuforums.org/showthread.php?t=1501761

I'm not sure what else to try. I could try different XSERVER config
options in the lts.conf but am not sure why I would need to.

Suggestions most welcome!! :)

Thanks,
Andrew