"Remove and reinstall the indicated ink cartridge, making sure it is correctly installed, and then touch OK." I removed both cartridges, cleaned their contacts, and reinstalled them, but problem still exists. I reinstalled both cartridges because I didn't see an instruction to remove/replace one specific cartridge. Occasionally, the printer will print and does so perfectly in color. Then, error message appears.
For example, I also reinstalled the printer hardware and software-wise. Then, I printed the test page, and it printed perfectly. However, the error message appeared after printing. So, I pressed OK, the message disappeared, and the normal display is showing. Word and Settings now say the printer is Offline, and the printer won't print.
Thank you, KrazyToad, for your comprehensive response. However, I bought an Epson XP-6100 All-In-One Ink-Jet Wireless Printer. With some head scratching, I managed to install that printer, and it seems to be operating OK so far. When I get a moment, I will try the procedure you sent me to see if I can resurrect my HP printer.
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