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To begin with, you should make sure that the paper is loaded in the main tray, and then you should turn on your hp printer. Next, you are advised to download HP Print and Scan Doctor - Printer Offline, and then follow the prompts to install and open the tool. On the welcome screen, you should click Start to select your printer and run the diagnostic. It will bring back your hp printer back online.
https://printersofflines.com/blog-post/hp-printer-offline-issues/