Weird problem with vista boot.

[Noufas]

i recieved my copy of vista ultimate today. i installed and i have the system working great.
the problem happens when i restart my computer (for any reason).
if i dont have the vista dvd inside the drive, i get the not a system disk, insert disk and press enter (or something along those lines)
this happens even with the drive alone (all other drives including dvd drive removed)
any help ?

 

[Noufas]

yes vista is the only os.
boot drive is cd : vista hd : then nothing.
even if i put vista hd on its own, it tries to boot from the cd.
its so weird as i didnt do anything on the bios (update or anything like that)

 

[Noufas]

i stripped down all the drives, installed vista on another drive (pata 200gb) and then i connected all the drives again.
works like a charm now