In the past we would take such to a shop or have our IT staffer come over to try such out. Today folk want a correct diagnosis without letting a tech see the bad devices and will lash out at anyone that helps or tries to help.
We brought this on ourselves with the lower costs. You can get a printer for 99 bucks so why is there any doubt it's not the Apple/PC at issue here? Did they find local support?
My father is in his 80's. He was having printer issues, HP convinced him to buy new ink. When that failed to fix the problem (he now has $70 of worthless new ink), they convinced me to buy him a new "refurbished" printer at a "special price" for loyal HP customers (the old printer was 3 years old). We also bought the extended warranty. The new "refurbished" printer worked for a little over a month and then it also indicated low ink. My father called HP, they told him he probably needed new ink, again. He ordered new ink and of course that did not fix the problem. Then HP told us they would send a replacement. They did. To me (and not my dad) on the other side of the country. I am now 4 hours into customer service calls, transferred five times. One customer service rep told me that the problem was Windows related issues are handled out of customer service in Mexico, while Mac is handled in Canada. Apparently you can blame on operating system for sending something to wrong address. Complete incompetent clowns.