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Hi, I've been struggling with a HP photosmart C4480 which won't print and keeps showing 'incompatible print cartridge(s). In my attempts to fix it I did manage to print an alignment page once and I know the cartridges are the right type and correctly installed. I've tried many times to reset it by unplugging etc. I suspect it's to do with the software but not sure. I gather it might be helpful to take out the rechargeable battery and put back in, but I don't know if my machine has one or where to look for it. Any suggestions welcome! Thanks.

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Ps It's an old printer, no not teething troubles. If time to replace, any advice wlecome. Thanks again!

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