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My HP photosmart 7900 series crapped out on me. It started printing horribly grey images.
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there is most likely nothing wrong with your printer, especially the second one, the newer one. but there might be something wrong with one of the ink cartridges. if you are printing directly from a camera memory card, all of the color matching shld be done internally in the printer and you shld be getting decent prints. my first instinct would be to check each ink cartridge and make sure it's in the correct slot and that it's seated properly and next i would pull every one of them and make sure the tape had been pulled from the ink cartridge head. it sounds very much like one of your color ink cartridges is not feeding ink properly.
i also know a tiny bit about the D7460. it uses the new 02 inks. these are exceptional inks at a remarkably lower price than the older HP inks. i have a printer which uses these and they are really quite remarkable. so, i'm very suspicious here of the installation of the inks. i believe the D7460 uses six cartridges. if any one of them is empty or not installed properly, you could get that gray toning. so, you're going to need to check each and every ink cartridge here. make sure there is no tape over the head. make sure the cartridge is in upside right and fully seated with the locking arm fully clicked down over the cartridge and that each cartridge is in the proper slot. putting the yellow in the magenta slot, for instance, is going to screw things up. i know all this sounds a bit patronizing and such, but it's something you need to do anyways.
and, if none of that works, try using HP's online tech support. they are generally pretty good. i've used them before and it was generally pretty painless
and come to think of it, the 02 inks dont have a sticky tape over the cartridge head, so that bit would only apply to the older printer.
and, if that doesnt do it, take the printer back to the store and have them print something there with that printer.