I have now received the head cleaning cartridges and used the colour one as per instructions over several 5-cleaning cycles. The yellow is still completely missing from the test prints (its a 5 ink cartridge).
I want to avoid replacing the printer if at all possible as I bulk bought a load of black and colour cartridges ready to print a lot of photos. I will try the "clean and leave overnight" but would appreciate any other ideas in case this does not do the trick.
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