Cannot print to OfficeJet 8725 connected to my home router. This just started after more than year.

[SteveL4]

Unable to print wirelessly (or via cable) to OfficeJet 8725. Have not had any problems for more than a year. The printer will connect to the router, but when I try to use the same network security key from the laptop, I get an error. The internal test page prints OK.

[sandytechy20]

@SteveL4

Welcome to HP support community.

Perform a power reset

1. Turn on the printer, if it is not already on.
2. Wait until the printer is idle and silent before you continue.
3. With the printer turned on, disconnect the power cord from the rear of the printer.
4. Wait at least 30 seconds.
5. Plug back the power cable straight to a wall outlet and printer without any surge protector.
6. Turn on the printer.

Restore Network Defaults and connect the printer again to the router

1. From the home screen of your printer control panel, touch the Wireless icon .

2. Touch the Setup icon .

3. Touch Restore Network Defaults or Restore Network Settings, and then touch Yes to confirm your selection.

4. After the default network settings are restored, touch the back arrow, touch Wireless Settings, and then touch Wireless Setup Wizard.

   The printer searches for available networks.

5. Touch the name of your wireless network.

6. If your wireless network does not display in the list of wireless networks, touch Enter New Network Name, and then type the name of your wireless network.

   NOTE: 

   Type the exact network name, including any uppercase and lowercase letters.

7. Type the WEP or WPA key (network password), and then touch Done.

You can refer this HP support document for more assistance:- Click here

I hope that helps.

To thank me for my efforts to help you, please mark my post as an accepted solution so that it benefits several others.

Cheers.