Hp 5550 color printer

Check the black clip on cover on top of the paper pick up assembly under the cyan cartridge.

If it is not fitted correctly cyan will not print and no error message will be displayed.

Have you check your color cartridge if they are properly installed.

Make sure your are not using a refill cartridge.

Replace your tri-color cartridge with original an HP tri-color cartridge.

If the Cartridge and printer alignment is successfull and you are still not able to print in color, mostly the Color print is disabled in your pc

Click on START Button
Click on CONTROL PANEL
Open Printers and Faxes folder
Highlight the Printer icon for Deskjet
Right click on the printer icon and choose Printing Preferences
Under Printing preferences, you will find Printing mode - It must be on BLACK or GREY SCALE, Change to COLOR/ ALL
try printing.

Check the black cover on the pick up assembly under the cyan cartridge. If it is only a fraction too high cyan will not print. Make sure it is clipped in place correctly.

This is typical cartridge problem.Which cartridge changed?This printer can print with the only one cartridge inside it, whatever which.Try this: Open cover put out color cartridge then close cover.If blinking stops replace color cartridge.If blinking continues put out black cartridge and put in color.If blinking stops replace black cartridge, if not stop replace both cartridges.
If this not help your printer has problem in carriage unit and need repair.

Here is a link to a page that explains how to clean the cartridges:
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=110&prodSeriesId=71895&prodTypeId=18972&prodSeriesId=71895&objectID=bpa00226

i had the same problem but i only replaced my black cartrage ink and my color was empty so if one is empty remove it and it will work

yes, remove the color cartrage and it will print

Your printer does not use #59 Cartridge!!!!

HP 56 black print cartridge (19 ml) C6656A HP 57 tri-color print cartridge (17 ml) C6657A HP 27 low capacity black print cartridge (10 ml) C8727A HP 28 low capacity tri-color print cartridge (8ml) C8728A

Here's A Trick you don't really have to buy a new cartridge if it a bit low but here how you do the trick.On the place where the ink leaks out dip some water on it with a paper towel and replace it back on the printer and guess what there's ink!