A fellow gladly traded his HP 1209 for my Epson 440 printer because he kept getting error messages. Thinking I had gotten the much better of the deal w/a more multifunction printer, and knowing of a similar but updated printer on sale at Goodwill, I bought the HP 1315 to offer him instead. I checked the 1209 and on the 1st run it worked fine, then I got the cartridge error he mentioned. I checked which cartridge was causing the error by removing one at a time & watching the message.. I tried the "bad" cartridge in the other printer & it seems to accept it (though it's giving a paper error). I ordered another cartridge, and upon 2 trials w/the 1209 it's still being accepted (printer fixed! yeehaa). Thoughts on why one printer accepts the cartridge while the other one doesn't?