One of my flock writes thus 'My Canon A3 printer -i9100- is now printing silly colours, both on letter paper and on photo paper. A holiday pic of tourquoise sea/beach came out in magenta! Another of same scene was not far off all black. A while back it printed a severe b+w diagram as mis-placed jigsaw pieces. Some wise wag told me it was printing what I had told it to print! Not helpful but undoubtedly true. I've run the various checks:- head alignment, nozzle clean etc. to little effect. Any suggestions before I take my pics to Boots?'
My immediate thought it must be what the computer is sending to the printer as suggested by the said 'Wise Wag'- but then I wondered 'Is it - could it something have corrupted the machines driver or firmware. Any thoughts