There could be a number of reasons why HP DeskJet 2600 shows offline errors. But you can try fixing this error by yourself with some troubleshooting methods. Here is how you can resolve HP DeskJet 2600 Offline issue.
• First, make sure both ends of the USB cable are connected properly to the devices.
• Ensure you have connected the printer to networks other than host or guest networks.
• Try manually setting the printer to online by selecting the Use Printer Online option.
• You can also try to fix the error by switching to another connectivity method. You can access it via Ethernet or USB if you have any problem with wireless.
• Make sure you are using the updated printer driver. Reinstalling your HP printer drivers can also assist in resolving the offline issue.
• Disabling Simple Network Management Protocol (SNMP) may also troubleshoot the offline problem.
• The last method is to remove and reinstall your printer. Perform HP DeskJet 2600 Setup again and check if the offline error is resolved.