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Yes, that is a printhead fail. Printheads are almost as expensive as a new printer for the Pixma iP4000. You can find the printhead on eBay, runs $50-$80. Better to put that money towards a newer printer. You can also look for scrapped or damaged i860, iP4000, MP780, MP760, MP750 model printers and salvage the printhead from those.
How long was the printer sitting not used? That ink is pigment based and is nasty when it dries out. The colors are dye based and do not have similar problems. It is likely the pigment has dried in your print head and clogged it. If print head cleanings are not fixing the problem, and you a confident in you abilities, you can disassemble the machine and pull the print head out. With it out you should let it rest for about 15-20 minutes on a paper towel soaked with warm (100 F) distilled water. CAUTION, ink will seep out of the print head, be sure to due this on something ink resistant, shop bench or plastic plate.
Buying a new printhead is a mighty good suggestion, it seems you have pretty well used up the maximum service life of your printhead, if i'm not mistaken. Try to reinstall your printer along with its software. Go to settings>control panel > remove hardware> then,reboot. After, rebooting, re-install your printer software and drivers.