Magenta and cyan will not print on my hp officejet pro L7590 -- it started with a paper jam that was corrected - ever since then only the yellow and black will print on the paper -- printheads are good and ink cartridges are full -- printer alignment test however fails and again only yellow and black shows up on the diagnostic sheet

Use your machines built in programme to clean the ink jet heads

I think you should clean and allign cartridgeS by going into tools menu. print test. GL

Ink levels are an estimate. They are approximated according to how much color might have been used. You may be out of all the color inks, they may be dried out or clogged. There should be a head cleaning operation for the printer, but it uses ink too.

Hi,
The inkjet printers print colors as they combine the major 4 colors contained in the cartridges CMYK (or said in words cyan, magenta, yellow and black) in some proportion.
If you print black the printer gets ink from the black cartridge only. If the black cartridge is empty some devices start to print black as a combination of the colors in the color cartridge - for example gets some of the cyan, gets some of the magenta, gets some of the yellow.
In your case maybe some of the other colors are empty too (or the nozzles are clogged) and the printer cannot prepare the correct mixture of colors to start printing black.
I suggest you to change both black and color cartridges.
Hope this helps.

Try using the HP Print Diagnostic Utility in Windows..

If you need more help post back!
Thumbs and testimonial are welcome!

Clean everything w/ slightly alcohol dampened q-tips. Run Cleaning program on printer. Align cartridges.

There are two possibilities here Joanne, first, it could be a false error message or else second, the Cyan/Magenta print head has gone bad.Try the following:
1. Take the Cyan/Magenta printhead out. Remember, the printhead...not the cartridges.
Clean the copper contacts with a Q Tip, moistened with plain water. Wait till it dries, put the printhead back in.
2. If this does not resolve the issue, unplug the power cord from the back and press and hold the power cord for 30 sec. This will drain all the static charges. Plug it back after a couple of minutes and see if the error message re appears.

I read earlier that black and magenta were printing but not cyan or yellow.....HP says to gently wipe the side of the electronic band but not the bottom, I did all of the above...and the printheads carefully, no change w/ the printout from "clean printheads"...the cyan had an occasional blue line(very fine) and there was no yellow.

So I trickled warm water over the cyan and yellow printheads....then thought what the heck, got a bowl of warm water and swished the printheads half submerged. They print perfect now I have the reds, yellows, greens and all the colors back w/ the clean printhead option and printed a coupon, it was perfect.

I hope it's not a short term fix...I developed the problem when I didn't print for a long time, hope this helps someone, Cyn

BTW, I flashed a light down in the recepticle for the cyan and yellow printheads and they were gunky w/ blue and yellow gook, so I clean that out w/ a damp lint free rag....paper towels shredded and I had to carefully remove the remnants.

Try turning off the printer and turn off your pc, now restart both and see if this helps. Any other questions please post back as everyone is more than happy to help you.

I had to turn off the printer & disconnect the power cord. I also had some material that was backed up on hold from the night before that was preventing the current material from being printed & I had to go in & cancel the documents to be printed before the printer would function.