disc brake roter wont work please help

hi i went to put a new disc roter on today and it was fine and then i put the mount on to the frame and the brake but i cant get the brake to line up with the disc it just wont move in less the bolts are really lose
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What frame?
Are you replacing like-for-like on the same hub
You have not changed any parts around?
hayes hfx 9 carbon brakes
they worked fine with the old roter but just not with the new one it is on the back of the bike
you have checked the pistons?
loosened off the caliper bolts to allow centering over rotor?
Same standard rotor as before?
Parktools :?:SheldonBrown
Parktools :?:SheldonBrown