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My HP DeskJet GT 5810 won't print power light always blinking no error on control panel just "O". Message saying "door open" though it's closed. how to fixed it?
Welcome to the HP Support Community.
Let's try to reset the Printer here:
Reset the product
Also, try connecting the Printer to a different wall outlet directly.
Also, let's try a firmware update: https://support.hp.com/in-en/document/c02919168
Let me know if this helps.
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