The only thoughts I have are:
I have the same printer.On a number of occasions,using a non hp cartridge,I had the same problem.Now I us e HP only and no problem.
You could also try an delete/re install of the printer and see if that clears the problem.If you are using w98,the plug and play may or may not install your printer successfully so you may have to end up doing a manual install(just FYI)
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