OfficeJet 8600 Pro + magenta has horizontal lines

I've tried everything I know fix the magenta - clean printheads, change cartridges - but no better. Called HP Support and they kept trying to sell me products to fix the problem. First it was a firewall, then it was a Mac tech. They addressed everything but the printer. Can anyone help with this printhead/magenta problem?
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Hey MrBig2000,
I see you are having a print quality issue with your Officejet Pro 8600 Plus. The first thing I would check is if the issue is only when printing from a computer or also with the self test printouts. Try printing the Print Quality Diagnostic Report from the front panel of the printer.
Follow these steps to print a test page.
Load plain white paper into the input tray.
On the printer control panel, touch the Right Arrow ( ) to display additional options.
Touch Setup ( ), touch the Down Arrow ( ), and then touch Reports .
Touch Print Quality Report . The Print Quality Diagnostics Report prints.
Example of a Print Quality Diagnostics Report
How does this report look? Do you see a magenta streak like you are describing?
Also, try taking a look at the steps in the document on print quality issues for this printer.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c02866222&tmp_task=solveCategory&cc=us&dlc=en&la...
Let me know how it goes,
Jason
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Hello Brembo50,
Welcome to the HP Support Forums!
Regarding the Officejet pro 8600 not printing a clean crisp black text, the steps you have done are very good attempts to resolve.
When you printed the cleaning, did the characters print clean and crisp? It should look like this:
Please excuse the blurry image and colors should be on the bottom of the page, how ever the above should give you an idea of what it should look like.
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I work on behalf of HP
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Officejet 8600 Pro+ Power-switch lamp cycling bright then dim

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Hi,
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Hi HugeLau,
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When prompted, type the Administrator name and Password for the computer, and then click OK. Wait for authentication to complete.
Click the Trash icon on the taskbar, click the Empty  button, and then click OK to empty the trash.
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Please let me know if this resolves the issue. thanks.
Please click the Thumbs up icon below to thank me for responding.
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Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
Sunshyn2005 - I work on behalf of HP

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Click on the "Thumbs up"button on the left to say "Thanks"
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(Although I am employed by HP, I am speaking for myself and not for HP)

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View Solution.

Hello wardell1,
Please take a look at this document and let me know if the troubleshooting steps help resolve your issue.
Good luck!
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View Solution.

I searched in the online stores available by HP and was unable to find this part. However, I was able to find that the part is available through HP Tech Support by calling in.
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I am not an HP employee.

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Hello dpipitone,
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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" to the left of the reply button to say “Thanks” for helping!

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View Solution.

scarlattid3,
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I'm a printer tech with HP.

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Please click the Thumbs up icon below to thank me for responding.
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Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
Sunshyn2005 - I work on behalf of HP

OfficeJet 8600 Pro + magenta has horizontal lines

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