Printer is not printing, Follow these instructions, To clear a paper jam – HP Deskjet 3820 Color Inkjet Printer User Manual
Page 71: Verify the following, The printer is connected to the power source, The cable connections are secure, The printer is turned on, The media is correctly placed in the paper tray, The rear access door is attached, The printer's top cover is closed

printer is not printing
verify the following
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The printer is connected to the power source.
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The cable connections are secure.
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The printer is turned on.
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The media is correctly placed in the paper tray.
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The Rear Access Door is attached.
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The print cartridges are correctly installed. For installation instructions, see
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is closed.
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When the Resume button is pushed and held for several seconds, a print
sample page prints out. This confirms that the printer is functioning properly.
check the printer lights
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If the Power light is blinking, the printer is in the process of printing.
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If the Resume light is blinking, press the
Resume
button.
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If the Print Cartridge Status light is blinking, see
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If all lights are blinking, see
.
select a topic below
If the printer still does not print, select the topic below that best describes the
problem:
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