Try the HP Print and Scan Doctor:
Download the version for your OS and post the results for us to see. I'd bet your router changed the IP Address that was assigned to your printer so now all of your applications and devices cannot find it.
Try the HP Print and Scan Doctor:
Download the version for your OS and post the results for us to see. I'd bet your router changed the IP Address that was assigned to your printer so now all of your applications and devices cannot find it.