When you don't use your ink carts for a while, when you get new ink carts that have been stored in warehouses for a number of months, or when you have refilled a slightly too dry ink cart, the print head nozzles on the bottom of the ink carts get clogged with dried ink. The printer head cleaner menu will not dissolve the dried ink. Water will. Try this. Soak the bottom of the clogged ink cart in 1/2 inch of hot water for 15-30 minutes. Blot dry with clean paper towel (you should see the ink color on the towel). Retry.

Thanks for the response, William_the_Scott.

I was kind of wondering whether new color cartridge would solve the problem, but was unwilling to throw good money after bad if the problem was with the printer nozzle, not the cartridge.

If you reckon the problem is with the cartridge, rather than a nozzle within the printer then maybe I will try the remedy you suggest. I'm working with the "trial cartridges", which probably don't have that much ink in them anyway, so your response sounds quite plausible.

Thanks again.