It has been sugested by HP that I try this forum for help.
The following is a copy of the email I sent them which describes my problem, I hopesomeone can help! Thanks.
language_code : en language : English Country of Residence : France product_line : 83 product_oid : 59868 product_name : HP Deskjet 840c Printer part_number : C6414K,C6414J,C6414A,C6414G,C6414N,C6414H purchase month : 8 purchase year : 1996 problem area : color and print quality problems serial number : [Text removed for privacy] operating system : Microsoft Windows Vista Home Premium 32 How is your product connected to your PC? : USB Cable problem description : When I try to print a page containing coloured items the coloured parts fail to print. (The items are totally missing, they are not replaced by grey scale images) I have done all the usual things as per list:-
troubleshooting : 1) Rebooted my computer. 2) Disconnected the USB cable and reconnected it. 3) Changed the colour cartridge. 4) Examined the printer settings in the control Panel, colour is selected and all other settings seem normal. 5) De-selected the printer as the "Default Printer" and re-installed it. 6) Run software that checks the driver is up to date and it is. 7) Printed the built in test page "beautiful color made easy" only the header and footer print,no colour! setting changes : No, nothing has been changed.
PS. I have owned my printer for many years and cannot remember the purchase date. tech skill : Intermediate first name : Grant last name : W[text removed for privacy]
Hi - Go ahead and try the steps in this document. It will walk you through cleaning the contacts on both the cartridge and in the carriage. What can happen over time is ink residue can accumulate on the contacts preventing the ink cartridges from working properly. If this doesn't resolve the issue, try setting the cartridge with the nozzles face down on a damp paper towel for about 45 seconds just to resolve any problems with the ink nozzles.
Hope that helps.
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In addition to the steps mentioned check the warranty dates on the cartridges as shown here. If they are years past the warranty period it is possible the cartridges have failed, even if they were new in the box. Also gently blot the printhead on a damp tissue to make sure that there are stripes of cyan, magenta and yellow color. If there is not a strong color blot on the tissue the cartridges are probably the issue.
The black-only test page confirms that the issue is in the printer or cartridges, not with the computer or drivers.
Thank you for your help. Although when tested by wiping on a lint free paper there was ink produced you were correct in suspecting the problem was the age of the replacement cartridge. I purchased a further new one and it has solved my problem! Once again THANKS!!!