hi all,i have a brother all in one scanner/fax/photocopier etc etc,problem is,i recently changed all 4 ink catridges,only for the machine to keep telling me that one of them needs repleacing...even though they are all brand new.i have used it a couple of times since relacing them all.have tried switching it off,and on again,fiddling with the cartridge etc...to no avail.can anyone please help?thanks in advance,rach x