If your hp printer says offline but connected to wifi is hooked up wirelessly, disconnect strength from the router after which plug it back in. Wait until your network comes returned online. In case your printer is connected the usage of a usb cable, unplug and reconnect the cable from the computer's usb port and the printer's port. Restart the laptop.
Just when I needed to print some bloxorz documents, my printer had problems. I followed your instructions and was able to get my HP printer working again. Thanks.