Hi, I’m Louie. Sorry you had to wait awhile but I’ll do my best to help.Initially, how was the "...checked the ink..." done please?
Can you please try?
...open it up again and inspect again the ink. The unplug while printer is still open/ink cartridges exposed.
Allow this unplugged condition for an exptended period of time.
Then plug back and go through the process of closing it up and try to print/scan.
...may have to be done a couple of times.
Say 30 minutes or longer please.
The idea is to dissipate whatever stored power hence the longer the better.
The plugging back/ turning on with the ink cartridges exposed is to 'jolt' the system into action; a hopeful workaround.
The prescribed approach is to fully dis-assemble even for just a look-n-see.
And the above proposed procedure is a safe workaround as nothing inside would be touched/worked on; only those normally interacted by a user.
Yes , unplugging is electrically safe as it isolates the printer from power fluctuations, failures, spikes and anything untoward from the main line.
However from a mechanical perspective, non-use is not recommended as it leads to pre-mature ink drying and/or the lubricants likewise drying.
Glad that the above information may serve your purpose.
Good luck and thank you too for the opportunity to be able to share the information.
If tried a couple of times and error persist, then it would be as posted above, full dis-assembly even for just a look-n-see.
In some instances, it may be dried ink, dried lubricant, paper debris, foreign object or even just the cartridge holder unable to slide freely.
Other than the above check / tries, all others would be internal hence the dis-assembly.
I realize that the above information may perhaps be not what was expected. Unfortunately, there is no quick-n-easy fix and neither is there a workaround; sorry for having to be the bearer of bad news.