I've just changed all four toner cartridges (genuine HP). Printer worked perfectly before. I've tried several cleaning pages and calibrations, but no improvement.
Would upload for the page so can tell you what is the faulty part
SOURCE: HP 2420dn printing gray and shadows
maybe the scan unit need to clean first you most sure that the toner cartridge is original and new then start clean th scan unit reflector 
SOURCE: HP Deskjet F380 won't print
i think the inside printer have dirt or obstacles that blocken the cartridges while printing.
try to clean manually the printer by using powerful air blower,repeatedly.
SOURCE: HP deskjet 2460 will print black on test page but
Go to printer settings/options and navigate to the color tab. See if you can find a setting which allows the printer to use only color cartridge, change this setting to use both cartridges.
SOURCE: HP 5550dn prints pink pages. I have wiped the
You need to replace the DC Controller PCB
HP Part #
For 5500 only RG5-6850-070CN
For 5550 only RG5-7864-000CN
SOURCE: I have a HP 9130 All-in-One Officejet printer.
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Hi. Since you already tried and test all major troubleshooting that should fixed the problem, and yet still geting same result. I that suggest that you need replace the Printhead. In most cases, cleaning the printhead by soaking it to a warm water for about 1 1/2 hour would clear/break the solid debris that is clogging the printhead. Try that first before getting a new printhead.
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