HP Pro 8500A printing quality

At first my Cyan would not print on the print quality page. i have changed all the ink Cartridges. I have ran the alignment and head cleaning process many times. The alignemnt fails and i have unplugged the power from the printer. I read where i could clean the print heads manually. i did this per the directions and the cyan started printing good on the print quality page. But now the Yellow and the Magenta do not print on the quality page. i took the print heads out and shook them a couple times and all four ink colors came out.
what do i need to do or what might be the problem. 

Hi @Frogg1977,
Thank you for visiting the HP Support Forums!  I understand you are running into some print quality issues with your HP Officejet A, at first the cyan would not print, but now the yellow has stopped printing as well. If you look on the printhead it advises not to be shaken, please remember for future reference to avoid any damage.
I would like you to start here: Printer Does Not Print Black Ink or Color Ink, or Prints Blank Pages, please complete ALL steps listed, focusing on the cleaning.
If you reach to the point of troubleshooting were you need to replace the printhead, I suggest you contact our technical support at 800-474-6836. If you live outside the US/Canada Region, please click the link below to get the support number for your region.
http://www.hp.com/cgi-bin/hpsupport/index.pl
HevnLgh
I work on behalf of HP
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    I work on behalf of HP
    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
    Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!

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    Click the “Kudos Thumbs Up" on the right to say “Thanks” for helping!

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