General printing error Ox610000f6 on HP 6500 printer

Hi,
I had an HP 6500 printer 6 months ago. It was working great at first and I love it. I went out of town for a month and when I came back, that error messages comes up when I try to do something like photocopy, scan or print from my computer. I don't have an idea why this happened.
All the inks in my printer are pretty good and not expired, about half way full. Tried to power cycle a couple of times but did not make any difference. Any ideas are well appreciated.
