Hello mbbb,
Welcome to the HP Support Forums! :) I see you are trying to print to your HP Photosmart 7520, but you are getting an error message that the printer is offline.
I would like you to start here and run the HP Print and Scan Doctor- It was designed by HP to provide users with the troubleshooting and problem solving features needed to resolve many common problems experienced with HP print and scan products connected to Windows-based computers.
If you are still getting the error message after running the PSDR please continue here: 'Printer is offline' Message Displays on the Computer and the Printer Will Not Print
Let me know the outcome, I will watch for your reply.
Thanks,