What makes the hp printer not printing black?

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  • Lv 7
    4 months ago

    you know, asking 12 times won't get you better answers...

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  • 4 months ago

    I have the HP Laser Jet Pro..... On occasion I'll have to pull out the black toner cartridge and shake it.

    I have used this thing for years.....I have only replaced the black cartridge once, none of the others.

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  • JetDoc
    Lv 7
    4 months ago

    Is it out of black ink?

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