Question about HP Officejet Pro 8500 Wireless All-In-One InkJet Printer

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Blue ink won't print

Magenta and yellow seem OK

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HP 940 poor print quality problems either the Cyan/Magenta OR Yellow/Black PRINTHEAD is causing the problem or there are air bubbles in the ink lines/PRINTHEAD assembly. This problem is normally caused by an ink deprime within the ink system and can be recoverable (assuming PRINTHEAD is not at END OF LIFE or severely deprimed/depressurized). Refer to the following suggested actions:

NOTE: We suggest you read thru all steps below first prior to activating any of the suggested printer routines as you may have already attempted some of these.


1. Activate a 'Clean Printhead' routine, 2 to 3 times in a row, from your TOOLS/MAINTENANCE menu, to see if this corrects the problem. This action will perform a printhead prime and try to re-establish proper internal pressures - this action will consume approximately 4% or 7% of total ink from each ink cartridge (depending on cartridge size):

2. To verify the lines are clear and working correctly, print the "INK RECOVERY TEST PRINT" from our Test Prints page:

3. Run the self-test print (under Tools menu - Reports - Print Quality Report), this will verify nozzle performance and that each color is firing a solid band of color (i.e. you should not see any bands or missing lines in the pattern). This is also a good test to help isolate which color (or portion of the electronic PRINTHEAD*) may be causing the issue. To see a larger swath pattern of each color we suggest you print the 4-color Test Print.pdf file located on our support page here:

4. It is also possible that either of the PRINTHEADs may have poor connectivity with the rear electrical pad/interface. It is suggested that you attempt to re-seat (i.e. remove and re-install) the Cyan/Magenta and/or Yellow/Black PRINTHEAD assembly. Click here for instructions:

5. Check PRINTHEAD(s) warranty 'end date' stampted on side the PRINTHEAD assembly while it is removed from printer (refer to #7 below).

NOTE: HP's PRINTHEAD removal/replacement instructions can be found here:

NOTE: Within the base of the ink cartridge there is a sensor which detects the presence of ink...if an inadequate amount of ink resides inside the cartridge then the printer will typically flag an alert "Cartridge Empty" or "Low Ink", etc. If "empty", then it is usually below 4% remaining ink.

6. It is possible a PRINTHEAD 'firing' or electronic failure issue is present (...electronic assembly which performs the actual 'firing' of drops onto the page)*. However, in most of these cases you would normally get either a 'Printhead failed', 'Printhead missing, or 'Replace Printhead' alert message or you would observe unrecoverable poor/severe print quality. Refer to video to see how the Printhead works:

7. Check the 'WARRANTY ENDS' date on the PRINTHEADS as it may be expired*. See 7th photo at the following link:

8. If either PRINTHEAD is expired then it may need to be replaced.*
For more information on this please visit:

9. If the above resolutions do not correct the issue, then re-priming or replacement of the suspect PRINTHEAD may be required to fully recover the ink delivery system.

NOTE: If you DO NOT observe a PRINTHEAD alert or error message, but instead observe substandard print quality (or completely missing colors) and suspect the PRINTHEAD may be clogged, then you may want to consider flushing the PRINTHEAD using an advanced 3rd party procedure:

10. If problem persists after following all suggestions outlined above, then we suggest you discuss the possibility of a refund with your local Costco (for the refilled cartridge purchase). We apologize for the inconvenience this may have caused you.

* The HP 940 ink-series printer models have two electronic PRINTHEADS (each of these electronic devices are responsible for pulling ink from the ink cartridges and then firing the ink droplets onto the paper) - both PRINTHEADS will eventually fail depending on printed content, printer duty cycle (i.e. typically rated for ~15,000 printed pages depending on image content & frequency of printing, although some printheads have reportedly reached end-of-life around 2,000 pages. Actual results will vary.). The average inkjet printer can typically be refilled with ~8+ complete sets of ink cartridges over the life of the printhead, after which, either the Yellow/Black and/or Cyan/Magenta printhead may need to be replaced (available at Refer to video on how the HP PRINTHEAD functions:


When the PRINTHEAD electronically fails typically the printer will provide an alert message when this happens, but if a printhead has suffered a deprime (i.e. loss of ink/pressure which results in no printing of color), it is possible to recover the ink system using a 3rd party PRINTHEAD priming tool, such as this one:

A PRINTHEAD "missing" / "damaged" / "problem" error has nothing to do with the HP940 refilled ink cartridges since these are just plastic tanks which hold ink - all ink formulations have been fully tested for compatibility with all HP printer systems. The timing of a printer/printhead failure is merely coincidental with respect to the use of refilled ink cartridges. Each PRINTHEAD is a complex electronic ink-firing assembly which sits directly behind the ink cartridges during the printer idle state; the cartridges plug into and feed ink to both the Yellow/Black PRINTHEAD and Cyan/Magenta PRINTHEAD.

All printheads will eventually fail depending on printed content, usage and time via natural electronics degradation. The Inkjet411 test labs have never observed a correlation between a refilled HP940 cartridge and the failure of the HP940 printer PRINTHEAD assembly. We trust you clearly understand our position with respect to this type of micro-electronics failure of a PRINTHEAD, should this turn out to be the root cause of failure.

CAUTION: Be advised, the use of compatible/clone cartridges (i.e. sold thru the internet from overseas) are known to be problematic and may cause printer errors and/or permanent PRINTHEAD failures due to incompatible ink formulations (particularly those inks which contain high levels of VOCs - volatile organic compounds). We do NOT suggest using or refilling these types of ink cartridges.....refilling of HP 940/940XL original/genuine ink cartridges is only suggested! (i.e. those with the HP logo displayed on the front label of ink cartridge only).

HP 940XL Ink Refilling Services & Additional Cautions:

If you need to purchase a new HP 940 or 940XL ink cartridge(s) and are trying to cut costs, we suggest you try a remanufactured ink cartridge from as their ink cartridges typically have the lowest cost in the USA, have a high reliability rating, come with a 1-year warranty and provide free shipping for all orders above $20 (offer to USA residents only). New PRINTHEADS (i.e. YELLOW/BLACK or CYAN/MAGENTA, respectively, would need to be purchased from )

Please let us know if you have any further questions on the technical information provided. For any additional questions please contact us directly:

Posted on Apr 01, 2015

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  • HP Master
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The cyan print head nozzles maybe blocked.
Inkjet printers need to be used frequently to prevent ink drying out and blocking the print head nozzles.
If the print head cleaning maintenance routine does not clear the blockages, then print head needs replacing, but it may be expensive.
It may be more cost effective to buy a later model and better printer than replace the print head.

Posted on Apr 21, 2013


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Posted on Jan 02, 2017

  • 419 Answers

SOURCE: printing yellow for black

Hi Jan,

Can you confirm that you are using a CIS or non-HP cartridges with this printer?

It sounds a lot like the printhead has reached a clogging point where sediment has built up in the black portion and loosens enough to printer a few lines before it re-asserts itself again.

Based on my experience of this printer, if you're using a non-HP delivery system for ink then you should consider replacing the black ink with a dyebase alternative instead of pigment.. Replacing the Black/Yellow printhead and running a number of test prints to purge the pigment ink in the printhead should then result in a clean and more reliable printout in future.

One other vector for problems is the cleaning area and I've found that this can become soiled with excess ink causing cross contamination within the inks of one printhead. As yet I've not found a reliable solution to counter this sort of issue.

Hope this gives some clues and hopefully some ideas of a fix.


Posted on May 28, 2009

  • 419 Answers

SOURCE: A blank page when coping or printing in black.

As with all of the solutions I've provided on this and the other HP88 printers, the problem is that the black printhead has become clogged due to the conditions the printer is kept in.

For some reason the pigment black ink in the HP88 printhead is particularly prone to clogging when used in hot, dry conditions where there is air conditioning or similar...

The only solution I have found to date is to replace the black ink with a dyebase alternative and use that with a new printhead. Finding this solution took me about 14 printheads and a lot of head scratching so it wasn't easy...

Finding a dyebase alternative may be difficult but whatever you do, make sure you purchase a remanufactured original HP OEM, not one of the all plastic designs with no black rubber bulb in the bottom of the printer. They fail and leak a LOT!.

Hope that helps..


Posted on Jul 11, 2009

  • 787 Answers

SOURCE: I have a HP CP1700

Make sure that printer ask for ink cartridges.It can ask for yellow and magenta print heads!!!Check this again and if need replace the print heads.

Posted on Nov 20, 2009

  • 1 Answer

SOURCE: my hp deskjet 1280 will not print yellow

Hello, this is Harry from
We had the exact same problem when printing, we used 3 different 78 colour ink cartages and they all said 100% full but did not work. We then had a look at the dates on the box and they were all expired so when buying ink from anywhere even PC world or Curry’s always look at the expiry date.
Today I went to PC world and purchased a new 78 ink which said expires July 2011 and it works perfectly fine.

Posted on Jan 04, 2010

  • 1 Answer

SOURCE: HP Color Laser Jet CP1215:

My HP Color LaserJet won't print under any condtion. On the surface, all appears well, but when I press PRINT, nothing happens. This problem started after I purchased a new Black print cartridge. I've pulled all of the existing cartridges; powered Off & On to calibrate and still no PRINT. Any help would be greatly appreciated.

Posted on Aug 10, 2011

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