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

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HP Officejet Pro L7780 Printer will not turn on. The power cord seems to be working. But the printer is not responding. It was working this morning but not this evening. I have tried the suggestions on the hp site.

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  • fixitguy3 May 11, 2010

    How do you know the power cord is working if it wont turn on?

  • Darla Haverstock
    Darla Haverstock Sep 13, 2013

    I have this same issue with my L7780. The power cord actually has a light at the end that plugs into the back of the printer that lights up to let you know that it is functioning. I used an electrical tester to test the actual power output from the cord and it was correct as well. I have tried unplugging replugging etc but still no power

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  • 269 Answers

Unplug it and replug it.Make sure there is power from the receptacle

Posted on Sep 28, 2009

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Good morning,am trying to fix a hp officejet pro l7780.It can't scan,copy or send fax.Could someone assist me please?


Does the fax/scanner light come on at all? If not, then that's the problem, because that's the only part that likely needs to warm up.

Sep 11, 2014 | HP Officejet Pro L7780 All-In-One InkJet...

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I installed hp officejet pro l7780 but failed to calibrate.


Partial reset the printer

  • Remove the power cable from back side of the printer while its ON.
  • Press and hold "#" and "3" button, while holding them both insert the power cable and release the button after 10 seconds.
  • If printer turns OFF, press power button to turn it ON.

May 26, 2011 | HP Officejet Pro L7780 All-In-One InkJet...

1 Answer

I need to reset my hp L7780 to oringal settings.


Follow these steps

1.Unplug the power cord while the printer is ON

2. press and hold # and 6 button at the same time

3. while holding them plug in the power cord

4. when the printer turns on release the buttons

It will take 2-5 minutes and it will restore the printer to factory setting that means you will lose all the numbers if you have saved in it and IP address if it has any.

Apr 13, 2011 | HP Officejet Pro L7780 All-In-One InkJet...

1 Answer

Our HP Officejet Pro L7780 All-in-One have had a paperjam. I have removed all the paper, but the printer shows the whole time there's a paperjam again. The printer makes a sound when you turn on the...


Try unplugging the power cord of the printer from the back of it while it's turned on and then plug it back in.
If you still gave the message try pressing ok and see if you get rid of it.
Here are some work arounds for that issue:*Try removing and reinserting the cartridges and make sure they are properly fitted in. *Remove and reinsert the duplexer *Try cleaning the rollers infront of the printer and from the back of the printer. *As for the rollers try, moving them and turn them around with your fingers. *Turn the power off and then on
This is a hardware issue already so if all else fails for your printer. It's better to just call tech support. If the printer is in warranty they will be able to replace it. If it isn't they might let you in on a good deal.

Feb 03, 2011 | HP Officejet Pro L7780 All-In-One InkJet...

1 Answer

Won't recognize black cartridge on hp officejet pro l7780


Ok what you need to do is powerdown the printer the pull all ink out of the printer power it on without in then power it down again and replace the cartridges. If this doesnt work go into the control panels and select the color of the ink as only B&W and print a test page

Oct 18, 2009 | HP Officejet Pro L7780 All-In-One InkJet...

1 Answer

HP Officejet Pro L7780 Prints photos too dark


try to do flee power cycle of the computer and then try to uninstall and reinstall the driver for the printer.

IF IT DOESNT WORK .LOG ON TO THIS LINK
http://techbuddies.org

Jun 12, 2009 | HP Officejet Pro L7780 All-In-One InkJet...

1 Answer

The auto-document feeder on our HP L7780 OfficeJet Pro printer doesn't pick up the papers anymore. The 'gears' are spinning, but the papers aren't advancing. I've cleaned the rollers, but that still didn't...


I put an elastic band around the black roller as it doesnt seem big enough and it works nearly every time now. Have done this with another L7780 Pro as well which fixed it completely on that one.

Jun 09, 2009 | HP Officejet Pro L7780 All-In-One InkJet...

1 Answer

HP L7780 will not align and will not print in black. When I print out the self-testpage, it prints only in magenta. I have gone through 5 hours of BS with HP and nothing seems to work.


I just went through this problem. I called HP and they said to do a Semi-Reset, which is where you first make sure the plug is directly plugged into the wall outlet, not a power strip or battery backup, unplug the printer while it is powered on, wait 20-30 seconds,and while holding # and 6 plug the cord back into the printer, wait for a message or blank screen and then push the "On/Off" button. This has worked for me a few times now, although you have to go through some setup to get it back to where you like it.

Dec 20, 2008 | HP Officejet Pro L7780 All-In-One InkJet...

1 Answer

My HP Officejet 7410 All-in-One keeps giving me the error message - Scanner failure - Turn power off then on. Turning power off then on, even disconnecting power cord, repeatedly does not solve problem.


Our HP Officejet L7780 displays the "Align Printer" message and then does it automatically wasting several sheets of paper aligning, then the next time we print a page the same message comes back. Is there a way to turn off the "align Printer" message. It is printing ok otherwise.

Jul 31, 2008 | HP Officejet Pro L7780 All-In-One InkJet...

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