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HP printer not recognising HP toner supplies as 'authentic'?

I have an HP LaserJet 2600n and when I insert toner cartridges it tells me "non-HP supplies installed" or words to that effect. Yet I have never bought anything other than HP toner, and from reputable stores, too - so they're not refilled cartridges or anything like that. Anyone got any suggestions before I call HP and condemn myself to several hours in tech support purgatory? I have tried Googling and I have tried the HP support pages, too. No dice.

Public Comments

1. try cleaning the contacts of the cartridges, restart the computer and then reinstall the cartridges.