We have two (2) nearly identical 8500 printers.
Each of them stopped printing anything with blue ink content, within the last week.
This occurred immedialtely afte running "clean print heads" on each machine.
Both now have new HP CYAN cartridges, which replaced other HP cartridges immediately after blue printing stopped ... so it isn't a cartridge problem.
Print head tests etc ... all say "good" black/blue and yellow/red both say "good"
All other combos ... including black ... seem to print properly green ... prints ... yellow, etc no blue working!!!
They both are out of warranty ... but both have been lightly used.
Anyone know the probable cause?
Are there independently replaceable print heads?
Can you provide guidance?