Hp officejet pro 8900

Trying to improve my print quality.  In order to change the black/yellow printhead I need to get the print heads to return all the way to the left of the machine.  I have tried pushing the star (*) and turning the machine on and off, but can't get access to the printheads.  The assembly parks itself on the far right instead of moving back to the left side.

Is you model the Officejet Pro 8600 or the Officejet Pro 8000?  Please confirm which model you have.  What exactly is the print quality issue you are trying to resolve by replacing the printhead?  What troubleshooting steps have you tried?
Bob Headrick,  HP Expert
I am not an employee of HP, I am a volunteer posting here on my own time.
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Similar Messages

  • Change picture size when sending picture from I-phone 5 to HP Officejet Pro 8900

    I just installed my new HP Officejet Pro 8900.  So far every thing is working great except when I sent a picture from my I-phone 5, the picture printed the full size of the 8 1/2 x 11 page.  Not only do I NOT want a picture that big but I do not want to go thru that much ink.  How do I change the picture size to a 4 x 6 or 5 x 7? 
    Any assistance would be greatly appreciated as part of the reason I bought this printer was so I could e-print.  I take and print a lot of pics from my phone, I was hoping to avoid having to e-mail  pictures to computer in order to print.
    Thanks for your help.

    Hi BFPadmin,
    Welcome to the HP Support Forums.
    You didn't say whether you were sending the picture from your iPhone using Apple's AirPrint feature or using HP's ePrint app.   I have included a general document about printing from an Apple mobile device and it details the different ways to print to your HP printer.  I have also included the FAQ documents for the HP's ePrint app and HP's Printer Remote App.
    Printing from an Apple Mobile Device
    http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c02796271
    HP ePrint Mobile App FAQs
    http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&dlc=en&docname=c01923321
    HP All-in-One Printer Remote Mobile App FAQs
    https://h10025.www1.hp.com/ewfrf/wc/document?cc=us&lc=en&docname=c03561640#N132
    Regards,
    Happytohelp01
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  • Wireless Officejet pro 8900 stopped printing

    Our Officejet 8500 A909g mysteriously stopped printing wirelessly today. Windows (7) is unable to troubleshoot and it is happening from both the household laptops.
    I've tried turning it on and off,
    Turning the Wifi router off, printer off, wifi on, printer on
    Changing out nearly empty cartridges
    Typing in the printer's IP address., which shows status as ready.
    Printer will print test pages through IP address, but will not print test pages through Windows,
    Attempts to install a duplicate copy of the printer through Windows devices fails.
    I'm out of ideas.  Can anyone help me?
    Thanks in advance.
    Laura (Personal information removed)
    This question was solved.
    View Solution.

    Hi @hedgemeister,
    Welcome to the HP Support Forums!  I see you are not able to print wirelessly to your HP Officejet Pro 8500, you are using the Windows 7 Operating system. To better help you can you please leave me with the following information:
    1. Do you get any error messages when you attempt to print?
    2. Have you recently made any changes to your computer, updates, firewalls etc?
    3. Does the print job send to the print queue and then disappear?
    I would like you to run the HP Print and Scan Doctor > www.hp.com/go/tools
    -- It was designed by HP to provide users with the troubleshooting and problem solving features needed to resolve many common problems experienced with HP print and scan products connected to Windows-based computers.
    Please let me know what the PSDR finds, I look forward to hearing from you.
    Thanks,
    HevnLgh
    I work on behalf of HP
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  • IP Printing: HP OfficeJet Pro K850 not in driver list

    Hi
    After hours of work, I reckon I cannot solve the following problem on a iMac running Tiger 10.4.11 by myself. I installed a HP OfficeJet Pro K850 on my Mac directly trough USB, and everything worked fine. Then I decided to upgrade the whole system by connecting the printer trough a D-Link DP-G321 Print Server, in order to share the printer for the entire network. Despite everything works fine with Windows PCs, I can't get it to work with the Mac. By adding the K850 to the printer list, after typing the IP Address of the print server and the queue name, I have to choose the printer manufacturer and the model. Sadly, there is no entry in the HP list saying OfficeJet Pro K850, nor any similar printer models. I then simply tried to add the printer as a Generic PostScript Printer and print a document. I am sure there is a connection between my Mac and the printer, for the printer began to print strange texts until I pressed the cancel button on the printer. So it seems to be a driver problem, in fact the printer does not appear in the driver list, although the driver is (or should be) installed on my Mac (from the HP OfficeJet Pro K850 driver CD). How can I get the driver in that list? Appearantly, there is no "standalone" driver provided by HP, since the driver should be integrated in Mac OS X Tiger (at least that's what HP told me).
    Any help would be very appreciated!

    You can find this issue addressed here many times - but I guess you would need to know some background first...
    There are two kinds of drivers on OS X - Carbon and CUPS. Not like on Windows, where a driver is a driver. Manufacturers of non-postscript printers mostly provide Carbon drivers, where they can specify which comm protocol it uses. Your HP driver is written for USB only. You need a CUPS driver to use the network protocols, which are all part of CUPS.
    Install the 3-part hpijs driver:
    http://www.linux-foundation.org/en/OpenPrinting/MacOSX/hpijs

  • My HP OfficeJet Pro 8600 won't connect to my wireless router

    This is bizarre.  I have had my HP OfficeJet Pro 8600 for about 6 months.  It has generally worked fine, and we have used it wirelessly only.  But now it refuses to connect to the router.  It can FIND the router, and it can find other networks in the area, but it won't connect to the router.  I ran the Wireless Network Test, and the results say:
    Wireless On - Pass // Wireless Working - Pass //
    Network Name (SSID) found - Pass //  Wireless Networks Detected - 9
    Printer Settings Consistent with Wireless Router Settings - Pass / No Filtering - FAIL //
    So it recommends solution as follows: "1 If MAC Address filtering is enabled, and you would like to keep it enabled, you must add the Mac address of your printer to the list of permitted devices for your router before continuing."
    Except, guess what, I don't have MAC Address filtering enabled.  I wouldn't know how to do that, much less check for it.
    Also, before today, this was never a problem.  HELP!
    Thanks....
    If you are interested, here's more detail and background.  
    Before today, the only problem we have had is that frequently our Apple laptop (OS X 10.6) has trouble connecting to the printer.  This has been odd because the printer is connected to the network, and so is the laptop, but the laptop can't find the printer - it thinks the printer is "offline" (even though it's not).  Usually, if I wait a while, it will find the printer, and it will resolve itself work fine.  If not, we sometimes have found that it can fix itself if you restart the laptop -- restarting the printer does not make a difference.   In fact, I did exactly that today, and it resolved itself.  And I printed.  Fine, right?
    But then I wanted to do more printing, and the problem of the laptop not finding the printer came up again, so I decided to really "get to the bottom of this."  I don't remember exactly what I did, but somehow I was persuaded by the online help, that the correct solution would be to go into my System Preferences / Print and Fax, and click on the "-", which de-installs the printer, with the idea of re-installing the printer.  But then when I tried to re-install the printer, it could not find the printer.  Ugh!  Wierdly, it found an 8600 Scanner, but not an 8600 printers.  After installing and de-installing the 8600 scanner a few times, I eventually deinstalled everything, and I decided to start from scratch.  I got my HP disk, and installed all the software again from the beginning (even though it was already there), and then it looked for my printer, but couldn't find it.  So then I got a USB cord, and plugged that in.
    So, now I have a situation where I do have a working printer via the USB cord, but no wireless connection at all.  In particular, since the Office Jet Pro 8600 won't connect to the router, I don't know what else to do.  My Apple MacBook pro is 2 feet away from the printer, and it is connected to the router just fine (as is my blackberry), and I have never before had a problem connecting to the wireless router by the printer.
    Any suggestions?

    There are two things that can trip the mac filtering test to fail:  actual MAC address filtering setup (sounds like this is not the case) and using wireless channel 6 or automatic for wireless channel in the wireless network settings (in the router).  Since it does show failed for MAC filtering and you do not use this option, try changing the wireless channel in the router to 1 or 11.  Those two channels provide the best compatibility with printers due to less interference.  Almost everything defaults to auto or 6 for the channel and this causes a lot of interference.  This change should not affect anything at all.  To do this, you may need to contact the router manufacturer as the process differs from router to router.
    What brand and model is the router?
    Has anything in the network settings changed at all?
    What version is the Mac OS X?  There may be additional steps to take as it sounds like there are two separate issues involved and this could be revisited later.
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  • Unable To Communicate With Printer HP Officejet Pro 8600 (Network)

    I recently purchased an HP Officejet Pro 8600. One morning a couple weeks ago I tried to print something and I received a prompt saying "Unable to Communicate with Printer (Network)". I turned off the printer and turned it back on which did not help, I then turned off my wireless network, turned it back on and still nothing. I finally figured out that I first have to turn off the printer, then turn off my wireless router wait thirty seconds, turn the router back on and the turn the printer back on. After these steps my printer was working. The next morning the same thing happened "Unable to Communicate with Printer (Network)" and I've been replaying Groundhog's Day ever since.
    Please help!

    Hello msheehy-
    I would like to help you with this issue. It sounds like the router is changing the ip address of the printer. This could be caused by a couple reasons. (ip lease time, power loss to the router) I would recommend looking at the following link. http://h10025.www1.hp.com/ewfrf/wc/document?docname=c03781399&cc=us&dlc=en&lc=en&product=4323648&tmp...
    I think if you would set a static ip address in the printer EWS you would better off. I hope this helps.
    Also, remember a click on the Kudos star to the left is a quick "Thanks" for a helpful post.
    Please select the "Accept as Solution" button on the post that best answers your question.
    I appreciate your input !
    Thank You,
    Donald

  • Unable to find network printer HP OfficeJet Pro 8600

    HP Officejet Pro 8600
    Windows 7 64bit
    updated router firmware
    Troubleshoot all item s listed by HP and with Windows
    I have been unable to print wireless from my laptop. Wireless network test results gives me a pass in all categories. Network name is the same on printer and laptop. IP address on printer and tcp  port are the same. Tried firewall on and off. AVG antivirus on and off. Unplugged printer, router, usb, restarted laptop. Nothing has solved the problem.
    I can see that the printer has an ip address. My router has an ip address and my laptop has an ip address. Should they all be different? I am using the ip address from the printer to set up the wireless printing when asked to enter the address.
    This has been the most frustrating process I have ever delt with. It should not be this difficult to set up. Please help.
    Thank you in advance for a quick solution.

    Shurlee, I want you to do is re-run the wireless setup wizard on your printer. Then uninstall it, and reinstall it again using the software I am going to link you to below. From what you describe it sounds like either an installation issue or an issue with your network. If this helps feel free to mark my post by hitting the star below my name which gives me a kudos - kinda like a job well done on here. 
    First if you use a USB cord, make sure to remove it. Do not plug it back in until the software directs you to. Then go through the Devices and Printers, Programs and Features and Device Manager folders and insure that all copies, files, and programs related to the printer are removed. Then as directed, restart the computer. 
    In the START menu type "%temp%" and press ENTER. Here I want you to press Ctrl+A and hit DELETE. Some of the files will not allow you to delete them, skip those files and delete the majority that allows it. 
    Download these files and install them. By the way these are for the N911a, but if you have the 8600 Plus or Premium you will need different drivers. 
    http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?cc=us&lc=en&dlc=en&product=4323659
    Install that and let me know the result! 
    Have a great day!

  • Constant Printing Restart on a networked HP Officejet Pro 8500 A909N Series printer

    Hello,
    I'm curious if anyone has run into this problem before.  I have a HP Officejet Pro 8500 A909n Series printer that I have setup as a network printer.  This has been accomplished through a print server.
    I installed the printer's drivers based upon the cd that came with the printer, in the box.
    The problem is that whenever a user prints, say it's a simply one page document... the printer will repeatedly print that single page until it runs out of paper.  I have stopped/restarted the print spooler.  I've rebooted the printer and the print server.  I have deleted the drivers and readded them.  I've tried installing drivers from HP's website and then installing those.  I have attempted to delete the printer from the server and start from scratch.
    When I monitor the print queue, I can see the service restart after each document prints.  I can't figure out how to get this to stop.
    Does anyone have a suggestion; or has anyone run into this problem?  I'm not sure which forum to put this in.  I chose the Networks/Wireless forum, even though this is running on a wired network with wireless disabled.
    I certainly appreciate any asistance. 
    -Craig

    It ended up being an issue with the port.  I had used the same port as the last HP printer that I replaced.  This printer needs to run on a TCP/IP port, and not an HP port.
    Problem solved.
    Oh, and it was wired, with wireless disabled.

  • HP officejet pro 8500 fax

    I am getting 2 warning messages in the event log about every 6 to 8 seconds and it is affecting the PC's performance significantly. Window XP and tried hard wired and wireless setup with same result. 1st message is with event ID 4 and says "printer ... 8500 series fax is pending deletion". 2nd message immediately following has event code 3 and says " printer ... 8500 series fax was deleted". These 2 warning appear every 6 or 8 seconds. Somewhere in the event info it refers to localspl.dll but I'm not sure it is related. I tried turning the spooler off and printing directly with no effect. If I unplug and delete the printer, the warnings go away. But as soon as I plug it back in, it is found and re-installed and the warnings re-appear. One quirk: the printer is installed and shows but there is no 8500 fax showing. Nevertheless, I pretty sure I can still fax. I have not tried to uninstall ALL the HP software and re-install it yet as this appears to be a real headache.
    Any other suggestions, please?

    Welcome to the forums Joanda!
    I saw your post about the issues you are having with scanning and would like to help!
    Please let me know which model of printer you have:
    HP Officejet Pro 8500A e-All-in-One Printer - A910a
     HP Officejet Pro 8500A Plus e-All-in-One Printer - A910g
     HP Officejet Pro 8500A Premium e-All-in-One Printer - A910n
    Also let me know which operating system you are running on your computer.
    Thank you!
    R a i n b o w 7000I work on behalf of HP
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    “Thanks” for helping!
    Click “Accept as Solution” if you feel my post solved your issue, it will help others find the solution!

  • HP Officejet Pro 8500 A909a won't let computer boot up

    I have an Officejet Pro 8500 A909a series connected to my HP computer running Windows XP Home. It was
    working perfectly. Now it won't let the computer boot while it's connected to the computer. I can unplug the 
    USB cable from the computer and it boots fine. I can then plug the USB back in and the printer prints fine. I 
    ruled out bad USB ports as everything else USB works fine in the same ports. I put a brand new cable on and
    had same results. I rebooted the printer and computer, with same results. I uninstalled the printer and drivers and
    reintsalled with same results. Computer freezes at the screen where it askes you to use the up and down arrows
    to select OS or wait for it to count down to 0. With printer unplugged it boots perfectly. This just started about 
    4 days ago. New printer. HP Support was at a loss when I did the live chat. Can anyone help?
    Message Edited by ComSource on 06-15-2009 07:14 AM

    Hi,
    The problem seems to lie in the installer, which has an unusual bad behaviour.  The installer puts the 8500 a909a in the list of USB  bootable devices.  (Not good!!!)
    When the printer is disconnected it isn't a problem.  When the printer is connected the computer tries to boot from the printer and the computer hangs.
    When I found the printer in the BIOS list of USB bootable devices I DISABLED that item in that list. Then it booted normally.
    But now the BIOS takes an extra 30 seconds or so but boot up seems to be preceeding normally.
    The guys on the CHAT and PHONE lines didn't even imagine the installer might be a problem so their advice was useless. They were blaming the computer.  More importanly, they didn't have a way to escalate the problem. They  had no capacity to respond in a flexible manner. It was like dealing with unhelpful staff in the county clerk's office.

  • HP Officejet Pro X476dw MFP switches itself on

    My Officejet Pro X476dw MFP just switched itself on.  It has been off for a few days; not sleeping, off.  I waited for it to do something, but it did nothing.  So I started the HP Utility to check whether the settings that govern sleeping and turning off and on had been changed.  They hadn't.  A few minutes later the printer seemed to be preparing to print something.  It displayed a message, "Preparing n ...", where n counteed down to zero, and then the paper door opened but nothing came out.
    Is this expected behavior?  The printer's firmware is up-to-date.  It is running in a Mac environment, connected wirelessly to an Apple Airport Extreme Base Station with a fixed IP address.  Two MacBook Pro's running OS X 10.9.5 and an iPad 3 and an iPhone 4S running iOS 8.3 are also connected wireless to the AEBS.
    Thanks,
    Richard

    @weirdharrell 
    ‎Thank you for using HP Support Forum. I have brought your issue to the appropriate team within HP. They will likely request information from you in order to look up your case details or product serial number. Please look for a private message from an identified HP contact. Additionally, keep in mind not to publicly post ( serial numbers and case details).
    If you are unfamiliar with the Forum's private messaging please click here to learn more.
    Thank you,
    Omar
    I Work for HP

  • HP Officejet Pro 8500A Plus printing issues

    I have been having two new issues suddenly (within the past 2 weeks) with my HP Officejet Pro 8500A Plus. I am trying to print from my iMac 27 inch running OS.X 10.8.4 Both the mac and the printer are connected to a wireless network via an Xfinity Wireless Gateway. I have just replaced the ink cartridges in the printer but am unable to print black & white. In fact everything is comming out kinda pink. I have posted on HP's support site and was told to
    Download and install this: http://support.apple.com/kb/DL907
    Restart your Mac.
    Reset the printing system:
    - Go to System Preferences > Print & Scan
    - Right (or control) click in the rectangle listing your printers and select Reset Printing System.
    WARNING - this will delete ALL of your printers!
    - Select the plus sign to re-add a printer. Select the Defualt tab on the top of the window. Look for the printer, select it and then next to the "Use" pulldown, select the printer model (not AirPrint). Wait until the "Add" button becomes available. Click it.
    Having done that initially my problem was solved. But now I'm having the problem again. I went through the above steps again, but still not able to print. Are there any suggestions for a fix. Is anyone else seen this issue? Is there a particular printer manufacturer that works well with Apple. Because at this point I have a large paperweight that is of no use to me!

    The fact that it was solved and then came back points to some (unknown) issue with your Mac's software.
    Try these generic fixes first (and then do the reset printing system and re-add again):
    http://support.apple.com/kb/ts1417
    (one of the three methods - I like Disk Utility best - you can also repair disk permissions while there.)

  • HP Officejet Pro 8500A Plus stalls displaying "Now Printing".

    Hi, in the office i work in we have 2 HP Officejet Pro 8500 A910 Series. One is networked to 3 PC's running WIndows 7 and the other is connected via wifi to a  PC also running Windows 7.
    The problem is the printer that is networked often stalls displaying "now printing" on the printer screen. The only way to continue printing is to turn the computer off and then on again, wait for it to do its cleaning etc then press print again. This is usually ok for that print job but as soon as further print jobs are added it has to be reset and the whole cycle repeats endlesly throughout the day. Until recently the other printer that is connected via wifi was working fine but now that is also doing exactly the same thing described above.
    Recently i searched the forums and have discovered this is a common problem with this type of printer.
    I have done partial and full resets of both printers to no avail.
    Bothe printers are currently using firmware version: LRP1FN1126AR , which i believe is the latest firmware.
    Please can someebody explain how to make these printers work properly? Many thanks
    This question was solved.
    View Solution.

    ok, i have done the most research into this issue of all people, as i bought 3 of them for buisness.
    the most common problem is the printer will only print for 20 or so mins after a reboot, then it goes to sleep,
    if attempting print after this time, it will display "now printing" but nothing prints.
    after hours to customer support, and a new printer delivered, plug in the expired/refilled genuine cartrige, same issue.
    you can wake up the machine tempoarily by opening and closing the cartridge door.
    i finally got the lady from HP to admit there is a page count on the chips, and instead of an error on screen,they do this to avoid law suits.she didnt admit to the last bit tho,lol.
    i have 3 expired , refilled genuine chips now, all do the same all after around 5000 pages.
    cheeky buggers!!
    someone with time and money, please sue them , im tired of bieng ripped off.

  • HP Officejet Pro 8500 A909g seems to destroy printheads

    My wife and I have identical “HP Officejet Pro 8500 A909g Series” (S/N: [Edited for Personal Information] for my printer) printers bought within several months of each other. We have owned the printers since late 2009.
    My printer quit printing cyan completely and magenta partially. I replaced both ink cartridges, which did not fix the problem.  I then removed the printheads and cleaned the electrical contacts with denatured alcohol and also cleaned the contacts in the printer.  This did not fix the problem either.
    So I “borrowed” the printheads from my wife’s identical printer and placed it into my printer. That didn’t fix the problem either.  When I put the borrowed printheads back into my wife’s printer, it immediately displayed the same symptoms as my printer (it wouldn’t print cyan at all and partially did not print magenta.
    The “Self Test Diagnostic Page” of both printers state that the printheads are “Good” in both printers.
    During the “Align Printer” task, the LCD on the printer displays a message indicating that the printhead(s) are bad.
    Question: is it possible that the printer itself is faulty and causing the printheads to permanently not work correctly?
    Second Question: If my printer is bad, what other similar models of all-in-one printers use the same ink cartridges?

    Hello Neil-in-Tucson,
    Welcome to the HP Forums.
    I see that you are having an issue with the Printheads on your printer.
    Are you seeing any error codes on the printers display screen?
    Please make sure that you have the printer power cable connected directly to a wall outlet and not a power bar/strip. Here is a document that uses a LaserJet printer as an example but it is meant for HP products in general. Please click on the following link that explains the Issues when Connected to an Uninterruptible Power Supply/Power Strip/Surge Protector.
    If you like, you can try calling HP's Technical Support to see about further options for you. If you are calling within North America, the number is 1-800-474-6836 and for all other regions, click here: click here. They will be able to get into more detailed troubleshooting.
    Thanks for your time.
    Click the “Kudos Thumbs Up" at the bottom of this post to say “Thanks” for helping!
    Please click “Accept as Solution ” if you feel my post solved your issue, it will help others find the solution.
    W a t e r b o y 71
    I work on behalf of HP

  • Hp officejet pro 8500 premier all-in-one printer

    The above printer is 1 1/2 years old and it has stopped printing.  When the printing became light, I installed new print cartridges less than a week ago.  Now, after five days, the printer is consistently cleaning the print heads and aligning the print heads and my documents are not being printed.  And, what is most frustrating, during all the cleaning and aligning, all of my new ink is gone and I'm receiving a message replace ink cartridges.
    Re: Problem with HP Officejet Pro 8500 printer: cleans printheads every time it's turned on
    Options 
    08-24-2011 06:34 PM
    Well,
    to this is say, "get used to it", or throw it away.  Many, Many, Many people have had trouble with this printer.
    The following are common and frustrating issues that this printer exhibits on a regular basis:
    1.  Constant Self-Checking (usually every 20-30 pages of print)
    2. Very persistant Printhead Cleaning/Checking, (Every startup and after about 20-30 pages printed).
    3. Worn-out printheads (usually within 1,100 to 1,500 pages printed).
    4. Paper mis-feeds. 
    5. Paper jams.
    6. Nearly impossible to use once the printer reports ink-depletion.
    7. Nearly impossible to use CIS Ink for larger print jobs.
    8. Ink and printheads "expire" regardless of when they are placed into service. (get a deal on ink or printheads last year?  Too bad, the warranty is already expired, most likely).
    In short, this printer is the most EXPENSIVE printer I've ever owned, and the most frustrating to use. 
    I have just over 2,000 pages of regular text printed matter with very little color, and have already gone through 4 sets of ink, and 2 sets of PrintHeads. 
    Although it's true that you can leave the unit on, and let it go into standby, you should NOT be punished with constant and time-consuming "self-checking" everytime it's turned on, or prints a handful of pages, BUT, it does NOT appear that HP will be standing behind this printer disaster.  AND, to make things worse, they've gone on to redesign it, giving it a different look, and so there are about 6 different models/versions of the OfficeJet Pro 8500.
    Anyone needing a reliable print/fax/scan/copy solution should look beyond this printer, because it will leave you wanting more, and spending more than you ever imagined you would have to on a late model printer.ro
    What is going on?  Why does it just automatically clean and align?  I also get alignment failed messages.  Any suggestiions?  

    rammerjammer,
    Thank you for bringing this to my attention, your feedback is very important and I want to do my best to help.  To answer what is going on, since the printing became light, started cleaning itself constantly, and fails the alignment, the printhead was damaged.  Click here to see and use the Limited Warranty for HP Ink Cartridges, Printheads, and Related Supplies.  There are many ways to contact HP.  The number to call is 1-800-474-6836 for HP and Compaq products for Home & Home Office use.  If you no longer have a warranty with the printer you can still use the warranty that comes with the printhead or ink cartridges.
    If you have a carepack with the printer that extended the one year warranty then the troubleshooting will be covered along with the printer if the printer needs replacing.  Check product warranty here, see HP Out of Warranty Support Options for Select HP Consumer Printers here.
    To order a new printhead you can go to HP Sure Supply and enter your printer or go to the HP Parts Store and order the printhead by part number C4900A for the Black and yellow and part number C4901A for the Cyan Magenta.  These printheads go by region also so be sure you are using the right region, these were found using the United States region. 
    The HP Officejet Pro 8500 Premier All-in-One printer has separated the ink cartridges from the printheads.  The ink cartridges are on the lower left and the removable print heads are on the carriage inside the printer.  The printer goes through a calibration process when turned on that will use ink.  Leave the printer on and let it go into stand by mode.  This type of printer is energy star efficient and made to calibrate on start up and be left on.  Allow the printer to clean or calibrate only if the printer must.  If it starts cleaning a lot it may be time to do a little maintenance to the printer (recommend once a month for maintenance).  Please see the following links for further details.
    Cleaning the Printhead Contacts
    Printer Paper Tears, Wrinkles, or is Damaged while Printing from the All-in-One
    Paper Path Issues in the Automatic Document Feeder
    Officejet Pro 8500 User Guide
    The printer has a duty cycle of 7.5k page/month.  The XL cartridges have a composite page yield of 1.4k pages with about a third of the black ink left over.  To me it would seem that the printhead should last somewhere in between.  This printer was designed to save money on ink compared to the rest of the officejets.  I hate that it has been causing so much trouble, hopefully the information I provided will help.
    HP Officejet Pro 8500 Premier (A909n) and 8500 Wireless (A909g) All-in-One Printers Product Specifications
    Click here for page yield information.
    Click the Kudos on the left side for helping and click Accept as Solution for providing a solution. I work for HP.
    Best Regards,
    Kenneth

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