If you have recently upgraded your version of OS X, or have installed the software for your wireless printer from the CD in the printer box, then you may have the wrong version of the HP software installed on your Mac.
To properly install the right software: Open a Finder window and go to the Applications / Hewlett-Packard folder. >Open HP Uninstaller.>In the HP Uninstaller window, click Continue.>On the screen that appears, choose your printer.>Press and hold the control, option and command keys and click Uninstall and A dialog appears, asking if you are sure you want to uninstall all HP software.>Click Continue.>From the Apple menu, choose Software Update.>From the Apple menu choose System Preferences.>In the System Preferences window, click Print & Fax or Print & Scan or Printers & Scanners.>In the list of printers on the left side of the window, select the wireless printer in question and click the minus sign (-) at the bottom of the list. >Click the plus sign (+) to re-add the printer.> In the Add Printer window, select your printer, and click Add.
If your wireless printer is already connected to your wireless router, you do not need HP software because both print and scan drivers are created in the new version of OS X. If your wireless printer is not connected to your wireless router, you may need HP software
If you still have difficulty in printing or scanning, removing and re-adding your printer and / or resetting the printing system, then often there is an effective solution:
From the Apple menu choose System Preferences.> In the System Preferences window, click Print & Fax or Print & Scan or Printers & Scanners.> In the list of printers on the left side of the window, select the wireless printer in question and click the minus sign (-) at the bottom of the list.> Click the plus sign (+) to re-add the printer.> In the Add Printer window, select your printer, and click Add.
If you still have trouble communicating with the printer, repeat this process, replacing the third step with: > Right (or Control) click anywhere in the printer list and choose Reset Printing System. For more information Click here HP Printer Help Number UK or you can also call us @ 0808-101-3524 (Toll-Free).