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Testing the cables is a common practice that must be followed first. It's likely that the problem is actually due to loose connections or worn-out cables. Check that all cables are connected correctly and that the printer is switched on. If the cable stops working, you should try putting it into a different USB port on your device or removing it. If the PC is connected via Ethernet, double-check that the Ethernet port is operational and that the connection between the PC and the printer is safe. Make sure your printer is connected to your PC network if you're using a wireless network. Additionally, make sure the printer is connected to a functioning wall outlet. Restart the Wi-Fi router if you're using a wireless printer. The “HP Printer Offline Fix” problem may also be triggered by a Wi-Fi router that isn't working properly.

HP Printer says Offline