HP Officejet 6500A Printer - How to fix General Printer Error

Patti, you may have to do a hard reset.
1) Disconnect the USB cable from your computer
2) Remove the ink cartridges
3) Unplug the power cord. Wait for a couple minutes. Plug the unit back in,hit power button if needed.
4) Wait for the "Insert Cartridges" message, reinstall the cartridges
5) Close printers doors
6) If you get a recalibration message, allow the printer to complete this task
7) Reconnect printer to USB cable
8) Try your printing again.
Check the attached links,instruction and guides, Good luck
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try this: http://h30434.www3.hp.com/t5/Other-Printing-Questions/How-to-fix-general-printer-error-OX6100004a/td-p/225711

have problem in my printer hp officejet 4255 oll-in-one it give message ERROR : 0XF0aF8005 pleas help me I can repair the priter if u can diagnose the error code