@Bunny1964
Welcome to the HP support community.
Make sure the cartridges are correctly installed
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Turn the printer on.
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Open the door to access to the cartridges.
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Make sure the label on the cartridge matches the label on the carriage.

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Make sure all the cartridges are firmly in place. If a cartridge is sticking out farther than the others, press it down until it snaps into place.
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If a cartridge does not stay in place, remove it from its slot, bend the tab away from the cartridge, and then reinsert the cartridge into its slot.
CAUTION:
Do not bend the tab more than 1.27 cm (0.5 in). Moving the tab too far might cause the tab to break off.

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Close the cartridge access door.
Clean the electrical contacts
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Open the door to access to the cartridges.
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Wait until the carriage stops moving before you continue.
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Push the tab on the cartridge indicated by the error message, and then pull the cartridge from its slot.
CAUTION:
Clean the cartridges one at a time. Do not leave a cartridge outside of the printer for more than 30 minutes.

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Wipe the copper-colored contact on the cartridge with a lint-free cloth.

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Place the cartridge to the side, with the contacts facing upwards.
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Wipe the contacts inside the printhead with a lint-free cloth.

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Insert the cartridge into its slot, and then press down on the cartridge until it snaps into place.
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Repeat these steps for any other cartridges indicated in the error message.
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Close the front door and cartridge access door.
You can refer this HP document for more assistance:- Click here
I hope that helps.
To thank me for my efforts to help you, please mark my post as an accepted solution so that it benefits several others.
Cheers.
Sandytechy20
I am an HP Employee