If you haven’t changed the router’s username and password from the default, see the documentation that came with your router. See the documentation that came with your router for the router’s default IP address. To access your router’s settings, open a web browser, type in the router’s IP address, and press Return. Some advanced router settings may be incompatible with your printer. Set a static IP address (one that will not change).Click the plus sign (+) and add the printer again.Select the printer and click the minus sign (-) to delete it.In System Preferences, click Print & Fax or Print & Scan or Printers & Scanners.

If the Update IP Address program is not available on your computer or did not run successfully, download and install the HP Print and Scan Doctor, select your printer, then click Next, then Fix Printing.If you do set a static IP address on the printer, you will have to run the Update IP Address utility again to update the software with the new address. In this case, it is recommended that you set a static IP Address on your printer.Click Search to ensure the printer can be found, and then click Save to update your software.Enter the IP Address from the Wireless Network Test report in the Printer's Current IP Address field on the computer.Compare the Printer’s Previous IP Address with the IP Address on the Wireless Network Test report.Select (click or touch) Utilities on the top of the Printer Software screen.Launch the Printer Software from the Start screen (icon for the printer model name) or from the tile named for your printer.Start -> Programs -> HP -> Update IP address.Windows XP, Windows Vista or Windows 7:.Windows – Run the Update IP Address utility, if it is available for your model.

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