Any ideas what's causing this very specific problem? I'm guessing it must be a fairly cut-and-dried issue, but Google isn't helping. Everything looks clean inside the printer and I've given the cart a good shake (which concludes my knowledge about printer servicing)
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I'm still thinking toner cartridge?; it's an original HP one off ebay, only fitted a few weeks ago (and they usually last me over a year); that said, as these printers were obsolete years ago, although the cartridge pack was sealed, it must be pretty old too - I don't know how well they keep (there's no date).
Thanks for any tips David