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

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L7780 has died. I unplugged the ethernet and the whole thing died

No power at all now. no #3 or #6 or ok #3 or 0n #6 or on ok nothing brings it back to life, I unplugged the power chord from a strip and put into a direct outlet. Nothing Dead! it's less than a month old.

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Return under warranty....sounds like power supply or main board died.

Posted on Jan 28, 2009

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3 Answers

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...

3 Answers

My HP L7780 will not print blue although it has a new cyan cartridge installed. The print head tests okay on the control panel.


If the machine functions well otherwise ( no errors ) then you should try to run the cleaning function from the printer software. Locate the printer in the printer folder and right-click the icon and select properties. Then select preferences at the bottom of the window, and select the maintainence tab. Select clean, and follow the directions. If you see no improvement after 3-5 cleans, it is more than likely the printhead. Contact HP directly to see about warranty replacement of the printhead. There is a warranty date on the side of the printhead itself. The printhead may also just be prematurely defective, so if out of warranty, try to replace it.

Sep 29, 2010 | HP Officejet Pro L7780 All-In-One InkJet...

1 Answer

The printer screen freezes and i cant do nothing i have disconnected the power sometimes it work but freezes again


Please follow the below steps.
STEP 1.
1. Un plug the power chord from the back of the printer.
2. Press and hold the power button of the printer.Wait for 30 seconds.
3. While holding the power button, re-plug the power cable.
4. Turn on the printer, if it is not on.
STEP 2.
1. Unplug the power cable from printer when the printer is powered on and wait for 20 seconds.

2. Then, press and hold # and 6 while plugging in the power cord.

Continue holding until it displays Semi Full Reset message in the front panel of the All-in-One.

May 13, 2010 | HP Officejet Pro L7780 All-In-One InkJet...

2 Answers

I have a paper Jam... how do I solve this????????


ok so the paper is in the printer right now and is stuck?

Jul 20, 2009 | HP Officejet Pro L7780 All-In-One InkJet...

1 Answer

Paper Size Error: The specified custom paper size is not supported in the selected tray. I have a Hp Officejet pro L7780 All in one. I checked the default printer and paper handling and it all says letter...


1. Press the OK button to bring you back.
2. Press the menu button repeatedly until paper size comes up
3. Use arrows to change paper size from automatic to whatever size you are looking for.
4. Start Copy

This worked for the HP Officejet 7210 All in one

Jun 01, 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...

2 Answers

"Turn Power Off then on Again" error


Try performing a reset on the device. Unplug the power cable, then hold # and 3 while powering it back up.

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

2 Answers

My printer won't print black or color ink. It makes a very loud sound and tells me that that it can't read my ink. I went to Office Depot and got new ink and no luck. Serial Number: HCFA98132 Model...


I brought a new Printer 1560 I have completed all the steps of formality but It does not print It spell out blank paper pls. shoot my problem as soon as possible.

Jul 27, 2008 | HP Officejet Pro L7780 All-In-One InkJet...

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