It might be worthwhile buying a set of Epson cartridges and seeing if that helps. If it doesn't then keep the Epsons in the printer and return it for repair under warranty. As far as I can ascertain, unless it can be proved that compatible cartridges were directly responsible for the hardware fault, then the warranty should still cover repair. HOWEVER, before you buy Epson cartridges (and I don't know how much they cost) Comet are selling a C46 on their website for £35 incl free delivery. I would suspect that that is very close to the price of new Epson cartridges.