Officejet Pro 8500 Premier - only one printhead is displayed in 'Printheads Health' window

I changed the black/yellow printhead today in my HP Officejet Pro 8500 Premier printer.  When I closed the lid, the printer did its housekeeping thing, clicking away while it aligned heads, etc, and printed out a diagnostic sheet that looked terrific.
So I wanted to see what the HP Utility would report as the health of both printheads now.  Only the Cyan/Magenta printhead health was displayed, both before I changed the printhead and now after I changed the printhead.  The utility reported the Cyan/Magenta printhead was in GOOD condition, along with a green button.  
But there was no image of the Black/Yellow printhead at all, so no button showing the health of the printhead that I just installed.    
While I was installing the new printhead, I wiped off the gold contacts on the printer where the printhead's contacts would meet.  They were  clean.  
Any suggestions aboutwy the software does not display the health of BOTH printheads?  
My operating system is Mac OS X 10.6.8

Hello garden-2009,
Welcome to the HP Forums!
I understand only one printhead is displaying the health using the Officejet 8500. I will do my best to assist you! I would recommend contacting HP technical support for further assistance. Click here to find out: HP Worldwide Contact.
Good luck.
I worked on behalf of HP.

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    Options 
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    Click the “Kudos Thumbs Up" at the bottom of this post to say
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    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
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    Please click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution.
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