So perhaps try removing the printer cable from the computer, remove the software program and re-install. If you do not have the CD for the software you can download the latest drivers from HP. At some point during the program install most HP printers tell you when to hook up the printer, at that point you connect the USB cord and follow the on screen instructions. We are assuming that when you switch the printer on it goes through the warm up process, does it do that?

wekick is onto something. In today's world we sometimes need to "reboot" things to get them to lose whatever they have remembered, from memory. Pull the plug or as suggested, throw the breaker for about 1 minute and plug back in or turn on the breaker.

Short version - ISP has been upgrading the system to increase band width in our rural area for the last 6 months. We would have experienced intermittent connectivity issues whenever equipment was switched out, etc. (Sure would have been nice if the support line, et al could have communicated that to the users.) Checked my power levels on my modem and they were within range but probably best to upgrade modem from DOCSIS 1 to 3 since they're going about this with their leased modems during the upgrading. I'll buy a Netgear modem to pair with my Netgear wi-fi router so as to have same company equipment.

I switched from Epson to HP as at least the color cartridges were replaceable individually - old Epson was not. What is weird is that it's just the black cartridge that is the problem - all the color 3rd party ones work just fine. Google told me this is a known problem - apparently, it's the control for the black that triggers the "this is not an HP cartridge" and then messes with the black one. What is strange, is that the 3rd party cartridges got excellent reviews on Amazon. I think they may have been from the 3rd party themselves - this is a big problem with smaller sellers on Amazon and eBay - they get their employees/friends/neighbors to write great reviews. These ink cartridges are a HUGE rip-off, price wise. Yes, I know - it's how the companies make their printers very cheap. I do use the color so I don't want a Laser printer and color ones are very expensive. Plus I really need the all-in-one in order to be able to copy and FAX. My HP is the HP 309a and has been a very good All-in-one printer. I'm a bit tempted to buy a new printhead on eBay for $35 and see if this fixes the problem with HP ink, but the ink alone is almost $100 for all the colors. I can buy a Canon for less than this. Yes, I was VERY uncomfortable with the HP Customer Service wanting to have access to my computer. I have allowed Apple to do this when I had a problem, but HP? And then when this guy started trying to scare me into thinking I had tons of "problems" and malware on my computer, I got even more nervous - HIGHLY unlikely on a Mac. Then we got to his pitch that he could "fix" my computer and "clean it" and then send me a reconditioned HP just like the one I had for $399. Whoa!!!!!! I did run a free and highly recommended malware program after this phone call - was afraid of what HE might have put on my computer! I was horrified to see that he had gone into Terminal Mode - this is BIG TIME and there would be no reason to do this if it were a software glitch - just reinstall the printer driers. No malware. He was just expecting me to be a typical non-computer savvy customer who could be easily scared into buying anything. Wrong customer!!!! But this experience certainly gave me a VERY bad taste in my mouth about HP and I won't buy one again. I'm in no hurry to make a decision. I don't need my Proof of Insurance card until 1 July and I have the tax document on my computer and can convert it to a PDF file, put it on a thumb drive, and print it off SIL's printer is needed (it's not - it's just for my records). But this experience showed me that it's not just those phone phony phone calls alleging to be from ones credit card company (funny - I don't have a Visa or MC so why are they calling?) that are out to try to fool the public. I would have expected better of a large company like HP. I have no doubt that like many large companies, they outsource their customer service dept to off-shore 3rd party companies and they are not very closely monitored. BIG mistake!