I think I'm right in assuming that the Canon i865 printer has the heads built into the printer in the same way as Epson printers. If that is the case, then it probably suffers from the same weakness as Epson printers in that if the printer is unused for a period of time, the heads can get blocked. The cost of replacing Epson heads is almost as much as a new printer. The only option is to try to dissolve the ink in the head. There are head cleaner cartridges available for the i865 such the one as at the bottom of this page click here, but some people have success with soaking the head in isopropyl alcohol, or an alcohol/water mix. It must be said, however that in many cases the head just can't be saved.