Question about HP Officejet Pro L7780 All-In-One InkJet Printer

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Hp officejet pro l7780

After changing ink cartridges, wont print blue or red colors, please advise

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  • RjeanT Aug 04, 2008

    We installed new ink cartridges blue & Magenta. They have not expired. The printer will not print in color. it does show that all inks are full. I have cleaned the print heads, re aligned the printer and no correction has been made. I have also looked in the manual and there are no troubleshooting answers for this. Please help.

  • jayozz Sep 05, 2008

    I have the same problem I have cleaned the print head several times. I don't see a cleaning tool on the menu as suggested. I also get horizontal lines equaly spaced but not every time.

  • Michael Colby Jan 27, 2009

    i have run the cleaning tool till the cows came home. Red prints brown and blue is closer to purple than blue

  • coins00 Feb 10, 2009

    cant print in black ,i replace the ink bus still have the same problem

  • diane1953 Mar 16, 2009

    I have HO Officejet Pro L7780 and have changed all ink cartridges.

    It shows all levels 'full' but it will not print red or blue... Anyone have any ideas howto fix this??

  • RjeanT May 11, 2010

    Thank you for trying but I have already done this.

  • Anonymous Mar 12, 2014

    after changing ink cartridges



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Run the cleaning tool before you print a test page.

Posted on Aug 02, 2008


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I have to ask this question of you, just to make sure this is not an issue. Are you using a factory new ink or toner cartridge?
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If you are using a refilled or third party cartridges that may well be your problem. Most manufacturers build logic into their products to prevent the use of “Other Equipment Manufactured” cartridges as well as re-filled cartridges.
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Try to reinstall your printer.

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I have the same problem with my Officejet Pro L7780, so you are not alone. Have you found any solutions?

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1 Answer

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Do you mean the ink cartridges or the printheads...

If it's the printheads see this solution:

It it's the cartridges you just open the little door (left/front of the printer), remove the cartridge which is flashing red and then put a new one in the same way.

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