HUH?!?!?!?!?!? tooki, maybe I'm wrong and just imagined the whole thing, but I can think of several DOZEN times I've booted many macs without monitors (being used as servers) including the LCs, cenris's/quadra's, Performa's, and aarly PMs all the way up to my G4 400 single! Maybe this is an error on the truley newer models but I can honestly say I've never had a mac not boot because it didn't have a monitor attached!

WAIT, now you have me thinking...were there monitors attached and just turned off? Dang-it now I have to go and experiment, I'll get back to this later.