Blue doesn't print. I've cleaned the print heads SEVERAL times and I've replaced the blue cartridge. When I do a nozzle check it sometimes prints partial lines but that's it. Pictures come out mostly red

1st a fall u must purchase original cartridge 2nd clean the head 3rd print the alignment page.
Be careful when u clean the head.
It is better if you use contact cleaner for head cleaner.
IN SHA ALLAH the problem will

How nozzle check result? Perfectly or Appear "another" lines.
Possibility: waste ink on the bottom plate of the head. Will disappear by itself, when used continuously. Try printing with enabling "Thick paper" option.

Did nozzle check show cyan and magenta lines?

With epsom ink jet printers the printhead is on the machine, not he cartridge as with many printers. This complicates things!
I suggest you get some cleaner cartridges put them in and run one single cleaning cycle each day until the cartridge is finished. Remember just One cleaning each day,,, this is to allow time for the cleaner to sit and "possibly" dissolve the blockage.
It is about your only chance of salvage.
An Ink jet printers worst enemy is sitting for long periods of time without printing on a regular basis, The ink dries in the print head nozzle!

INK PROBLEM
Inkjet printers need to be used frequently to prevent inkdrying out and blocking the print head nozzles.
If the print head cleaning maintenance routine does not clear the blockages,then print head needs replacing, but it may be expensive.
It may be more cost effective to buy a later model and better printer thanreplace the print head.

Inkjet printers need to be used frequently to prevent inkdrying out in the print head nozzles.
If the print head cleaning maintenance routine does not clear the blockages,then print head needs replacing, but it may be expensive.
It may be more cost effective to buy a later model and better printer thanreplace the print head.

Simple problem that print head cleaning will typically not fix. The black ink is pigment based so it tends to form more stubborn clogs. Just remove the print head and if you have a steamer hit the black printhead nozzles with some pressured steam. If not available, soak the surface of the printhead in shallow hot water (try not to get the contact wet or be sure to dry them if you do). You can tell if the printhead nozzles are open by folding a section of wet paper towel like 5-10 layers and then soak it, press the printhead surface up and down lightly on the wet paper towel and if the nozzles are open you will see some ink pulse in the black port screen (the colors will also pulse from the pressure of the liquid under the printhead). It's easier than it sounds so give it a try. I've saved 100s of Canon printheads this way.

Note: if you have a really dried out head, you sometimes have to soak from the top inlet ports and the bottom nozzle surface to clear, but unlikely in you case since you had a black cartridge installed with ink in it (this keeps the top port from drying).

change color cartridge then clean color head

Inkjet printers need to be used frequently to prevent inkdrying out in the print head nozzles.
If the print head cleaning maintenance routine does not clear the blockages,then print head needs replacing, but it may be expensive.
It may be more cost effective to buy a later model and better printer thanreplace the print head.

The ink solidifies right behind the micro printing nozzles. The only way to attempt to rectify this is to dip the print face into some warm (not hot) water for a minute or two, and dry after wards. If the cartridge recovers, Yippee, if it doesn't, replace.
Common problem. Be thankful it isn't a Canon or Epson, which entails replacing a seriously expensive 'print head'.