My HP All-in-1 Photosmart 2710, which I bougth 2 months ago, came with 2 cartridges already installed (strange in itself) - a tricolour no: 97 (C9363W) and a black no: 94 (C8765W). Both of these cartridges are not available in Europe (I live in Ireland) - I suspect they are US only. Printer operated ok until ink ran out. Bought 2 new cartridges - tricolour no:344 (C9363E) and black no: 339 (C8767E) - these are the cartridges stated on HP's website and the documentation as correct - they were also packed in the box of the printer. When these are installed the printer screen comes up with 'one or both cartridges are not intended for use in this printer". When only one is installed the message comes up "Printer cartridge 339 (or 344 depending which is installed) is not intended for use in this printer". I have done everything to resolve - chatted with HP Support - who have been useless and just told me what's in the documentation or on the website!! I've bought replacement cartridges in case the one's packed in the box are faulty - still doesn't resolve. My guess (and it is only a guess) is that the firmware in the printer is set to detect US only cartridges - but the printer was bought in Europe!! I have downloaded and installed the latest software and drivers - but still doesn't fix.