Hey There, I am Sofia Carter. If you notice the HP printer showing offline, some problem must have occurred. The issue will be that your printer may be off or it will be in sleeping mode. Hence, the problem can be fixed. You need to work on certain aspects of the printer to resolve the issue. The first and the foremost thing you can do is, check the connection of the power line. Switch off the printer and the PC. Remove the power line. Wait for one minute and then reinsert it. Start the printer. The printer must be online.