Sorry I took so long responding but I didn't get an email telling me that I had responses.
Dan, as it turns out, there is a thing in the control panel that says, "use printer offline" and if that's checked it won't go online. (Don't ask me how it got checked, I didn't even know it was there.) On the "devices and printers" page, select your printer, then click at the top of the page where it says, "see what's printing." That will bring up another window with a "printer" menu on the left. Click that "printer" menu and you'll see the "use printer offline" item. If it's checked, and you can, uncheck it. That fixed mine. (If it's greyed out, check to see if you're in admin mode; you have to be admin to uncheck it.)
Car2n, it's interesting you have the same symptoms with a different problem; mine is not a shared printer.