bootable cd on Compaq/HP portable

I have a problem with 3 different portables of Compaq/HP. It's about
Evo N800c, Evo N1020V and NX9010.
Those portables do not have a floppydrive. I'll have to create images
of each with Symantec Ghost. Normally I do this with the Ghost console
on the server and a bootable floppy drive on the client. I did make a
bootabcle cd with Nero 6.0 but not one of these portables works with
it. I tried the cd on and old Dell portable and there it works.
Is there anybody who can give me a solutions ?