Hi, I'm Robert and I'll be helping you with your printer question.
is this a wifi printer ?
what probably happened is that the printers received new IP addresses because they were turned off for so long while you were on vacation that the old one expired. The computer therefore does not know where they are.
what you want to do is go to the devices and printers folder.
remove the printers from there.
then click on the add printer button
let it search and it should find the printer(s)
one at a time select it and click next next next etc
it will reinstall it with the new ip address and it should work fine.