Hi, I have a 2001 Iveco horsebox too and mine did this once but did start later on. I was told by mechanic that this year onwards are started by a coded key and when starting to give it a moment to read the code. I used to turn it like starting a car but now I turn the key part way, wait til all the usual dash lights go out including the key code one and then turn the key the rest of the way to start, its only seconds but I havent had a problem since.
Bobbins
March 2010