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HP Deskjet 450 Printer - Shows Offline in Windows Vista
HP Deskjet 450 printer when connected to Windows Vista via USB may show offline even when the printer is in ON or Ready state.
Disable Bi-directional Support and Restart the printer. If the issue persist, try step 2.
Access the Windows Print spooler, Stop and Restart the services once, and check if the printer displays Online.
Also, in the recovery tab of the Print Spooler Properties, set the Subsequent Failures to Restart the Services a hit OK.
If the printer still shows offline, Uninstall and Reinstall the drivers using Add Printer Wizard in Printers Control Panel.