Question about HP Officejet Pro L7780 All-In-One InkJet Printer

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Printer on/of light is just blinking with a blank screen

The on /off button light is just flashing and the printer wont come on

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  • HP Master
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This sometimes happens when the printer logic gets caught in a loop.. Usually when a non-OEM (ie: not an HP branded) cartridge is being used.

The best and simplest approach is to pull the power cord out of the back of the printer, wait 30 seconds and then plug the printer back in.

I believe he L7780 has a firmware update that may help reduce or remove some issues so it's worth visiting the HP website and searching for drivers for your model to locate the new firmware.


Hope the above helps..

Posted on May 12, 2009

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Posted on Jan 02, 2017

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Lets try all factory resets, that will resolve this issue.

PARTIAL RESET:-
Unplug the printer power cable while its ON, press and hold # and 3 button and connect the Power cord while holding.Wait until the ON light flashes, then release the buttons.
If it didn't work try next reset.

SEMI_FULL RESET:-
Remove the ink cartridges, Unplug the printer power cable while its ON, press and hold # and 6 button and connect the Power cord while holding.Wait until the ON light flashes,or wait for 20 seconds,hen release the button.If the printer goes off don't worry release the button and Push the ON button.If it didn't work try next reset.

FULL NVM RESET:-
Take out the ink cartridges. Turn the printer OFF. Unplug the power cable from the back of the printer and from the wall outlet. Press # and 9 simultaneously and while holding # and 9 insert the power cable. Then release the button and turn the printer ON.

If you still have the same problem, printer needs to be serviced.

Thanks
Rizwan
rizwan84tx@gmail.com

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Please come back and just gave a vote, it will gave me some satisfaction to know am helping some one so I will keep on helping.
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