printer validation failed

[sammyaj1]

getting a printer validation message

printer was working fine up till now,please help

[Jeet_singh]

@sammyaj1,

Thanks for engaging in HP support Forums! This is a wonderful location to converse with the community, get assistance and find tips! I see from your post that you are getting validation error message while printing from your HP OfficeJet 7720 printer. Don't worry we'll work together to help you find a solution.

To provide you with an accurate solution, I'll need a few more details:

Have you recently made any changes on the printer before the issue started?

Do you get this error message on the printer screen or on the computer screen?

Did you try to run HP Print and Scan Doctor?

Are you able to make a copy from the printer?

What is the Operating system installed on the PC? Is it Windows or Mac

In the meantime, while you respond to this post with the details, let's try these steps here:

Perform a Hard reset on the printer and make sure that the printer is connected directly to the wall outlet and not to the surge protector.

With the printer turned on, disconnect the power cord from the rear of the printer and also unplug the power cord from the wall outlet.

Remove USB cable, if present.

Wait for 2-3 minutes, press and hold the power button on your printer for about 30 seconds to remove any additional charge.

Now plug back the power cable straight to a wall outlet without any surge protector or an extension cord and then plug back the power cord to the printer.

Turn on the printer and wait till warm-up period finishes and the printer is idle.

If you are facing any issue while using the printer then try using HP Print and Scan Doctor (PSDR). PSDR is an automated tool which can diagnose and resolve printing and scanning problems. Please go to this link: HP Printers - Using HP Print and Scan Doctor (Windows)  to download and run HP PSDR. Once you open the program, select your printer and click on “Fix Printing” to automatically diagnose and fix the issue.

Let’s try and make a “photocopy” to determine whether the issue is with the printer or not. Place a document on the scanner glass and choose “Copy” option. If the printer is making a good copy, then the printer hardware is fine.

Could you please respond to this post with the details and with the results of the troubleshooting as this will help me in further assisting you.

Eagerly waiting for your response!

that said, If the information I've provided was helpful, 

give us some reinforcement by clicking the solution and kudos buttons, 

that'll help us and others see that we've got the answers!

Good Luck.