I've had a Canon TS8050 photo printer for a couple of years. It ran off of the first set of Canon cartridges I got for it wonderfully, for far longer than I expected it to, giving excellent image quality. Then when it finally came time to change the ink cartridges I found that the colours continued to print very faintly, eventually fading to nothing.
It will now only print in black and white, specifically it will only print from the PGBK cartridge, judging from the nozzle test page. I've finally got around to trying another set of cartridges in it and the same issue persists, it will only print from the PGBK cartridge. I tried all the built in nozzle cleaning processes, but no improvement. I also tried cleaning the nozzle heads with warm water as per some instructional videos I found. Plenty of black pigment came out into the water but I barely saw any colour coming out into the water.
Any ideas? Have the print nozzles died, or something else?
Photos of test prints below.