There are many reasons why your HP printer may be offline. The most important thing to check first is whether it is powered on or not. Also check if the cables are plugged in properly. A paper jam can also cause your printer to go offline. CompAndSave Why is my printer offline will further help you in solving HP printer offline.
Sometimes, the problem is not the printer, but the cartridge. CompAndSave aims to help you solve cartridge problems. In this part of the HP Printer Troubleshooting Guide,
Hp Printer Troubleshooting when there is toner problem
Some of our cartridges may be pre-filled by the factory. We recommend opening the cartridge in a sink or trash can to prevent leaks from damaging your valuables.
In a vacuum the internal pressure is unbalanced. The cartridge should work fine. Let the cartridge sit on a paper towel for a few minutes (printhead down), then clean and install it.
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