HP L7680 power button and the OK button which clears error messages in the display is not working. Happened immediately after I cleared a paper jam. Machine was shut down for 24 hours to see if it would become functional again, but so far, no luck? Any ideas before I call a repair service? Thank you. Roz Harris [email protected] (518) 598-2419

Reboot it. Unplug wait plug it back in

disconnect the power cable from the back of the printer
press and hold the power button for 20-30 seconds
reconnect the power cable power onn the printer
beforte doing all these carefully check for bits af papers insiade the printer at the rear access door also
if still nothing happens follow the steps from the
document below
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00839319&tmp_task=solveCategory&lc=en&dlc=en&cc=us&lang=en&product=2512009
hope this should work for you or else plz call HP they will replace the printer for you ......................................god bless you (HAMID)

The clicking could be because it thinks there is a problem. Try doing the procedure for resetting the memory on the printer...
(For step 4, do # 3, # 6 as well)

1. With the unit turned on, Press the Power button and turn off the HP All-in-One.
2. Unplug the power cord from the Wall Outlet and then from the Unit.
3. Wait for 20 seconds , Plug the power cord into the wall outlet.
4. Press and hold # and 9 while plugging the power cord back into the unit. Continue holding the buttons down until the display goes blank or it shows a message.
5. If the printer does not turn on automatically, then turn on the unit by pressing the Power button & follow the instructions that display on the HP All-in-One to select the settings

check any alignment sensor. How aggressively did you clear the sheet of paper.

Here's a video that should help...

http://h30460.www3.hp.com/?fr_story=2304f3aa563aa6dbf7a24b8a764d74f1b43314d2&rf=bm&fr_operatingMode=OneSpecificStory

I had a paper jam. I removed the offending sheet of paper which unfortunately tore into 4 pieces as it came out. Upon piecing the sheet of paper back together - there is a small piece missing. I've checked the printer thoroughly - nothing can be found!

You may need to copy and paste these links into your browser:
Here is a link relating to clearing the paper jam error message:
http://h10025.www1.hp.com/ewfrf/wc/document?lc=en&cc=us&docname=c00743863&dlc=en&product=1119598

Here is a lik on how to do a power reset when all the lights are flashing.
http://h10025.www1.hp.com/ewfrf/wc/document?cc=us&docname=c01059445&dlc=en&lc=en&jumpid=reg_R1002_USEN

Joe
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I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

This worked for me. If "Paper Jam" error message continues to appear after jam has been cleared, turn off power to printer. Navigate to Control Panel - Printers, right click on HP Photosmart 2570 series icon, click on Delete on drop down menu. This deletes printer from your system. Turn on power to printer. Printer will re-install (may need original installation disc, may not). "Paper Jam" error message should no longer appear.

SolutionStep one: Perform a power reset and connect the printer directly into the electrical outlet Remove all the paper loaded in the main input tray.
Make sure that the product is turned off. 
Disconnect the USB cable from the back of the product.
Disconnect the power cord from the product.
Disconnect the power cord from the electrical outlet and wait 10 seconds.
Reconnect the power cord directly into the electrical outlet and check for the following.
Make sure that the power cord used is the one provided with the product.
If a computer is connected to the product, make sure that the computer is connected to a grounded (three-prong) wall outlet.
Make sure that the power cord is firmly connected to both the product and the power supply.
Reconnect the power cord to the back of the product.
Press the power button ( ) to turn on the product.
Reconnect the USB cable to the back of the product.
If the issue is resolved, proceed to Step six: Print a self-test page.
If the issue continues, proceed to the next step.

for more information please go to below link>>

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01458822&cc=us&lc=en&dlc=en

Thanks for using FixYa.

Check
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00265823&cc=nz&lc=en&dlc=en&product=422000&dlc=en&lang=en

"

HP PSC 1600 and 2350 Series - Paper Jam or Paper Feed Problems"

When the all-in-one detects a paper jam, the following message appears: Paper jam: Press OK to continue . The computer might display the following message: There is a paper jam (or misfeed). Clear the jam and press the Enter, Resume or OK button on the HP PSC. This document will assist in correcting paper-feed problems such as paper jamming, print slanting, and multiple pages feeding into the all-in-one. Clearing paper jams