Inkjet printer won't print black with full black cartridge

My printer won't print black, yet the estimated ink levels chart shows it's full. I've run the diagnistics page, but it won't print black eiher. I installed a new black cartridge a month ago, used it several times, althrough haven't used it much since.
MMelvilleAsked:
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walkman48Connect With a Mentor Commented:
MMelville
I have seen this a few time that the ports plug up use the clean printhead using the buttotn on the front of the printer. try 3 times (NOTE>> it does use ink to flush through the system.)

see: http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&objectID=c01289507&prodTypeId=18972&prodSeriesId=3434445

if that dosent work you will need to replace the print head Part # (C9381A) black and yellow are in the same print head
 http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?lang=en&cc=us&taskId=130&prodSeriesId=3434445&prodTypeId=18972&objectID=c01289505
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MMelvilleAuthor Commented:
Thank you. I ran the clean printhead twice and although still a bit streaky, something must have loosened up. I've printed a couple of items and it seems to be improving. The only issue -- though now unimportant -- I'm not certain what button you're talking about on the front of the printer.
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walkman48Commented:
Glad to hear that it worked out!
 the buttons I was talking about are what is outlined in the 1st link I provided.
the first step is performing a cleaning by using the buttons on the front of the printer the second step is performing the cleanings by using the print driver. Either way will do the same thing so as long as you got it to o a cleaning for you than all is well

Thanks!
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leech316Commented:
how come my hp k8600 wont print black text or color i just replace it i did everything to make it print black text but nothing is anything you can suggest i have 2 hp k8600 same problem email me leechviolator@yahoo.com
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