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I suggest that you make sure, using your Canon printer software, that the printer's status as regards toner (all/any color of it) and so forth, is OK.
Can you run a photocopy on the printer at this time?
Is the printer on a wireless connection? If so, unplug the WiFi router for 5 minutes. Then plug it in again, wait 2 minutes (restarting your computer meanwhile) and see if it now prints.
Is any error showing on the printer itself, as opposed to on the computer screen?
My mistake, Richard - the LBP series is the type without a scanning platform atop the printer.
No photocopy can be made then.
Has anything about your local network, or your WiFi router in particular, been changed recently?
Go to your WiFi router, check its lights, and their status. If there's a WiFi light, is it lit?
Does your computer get internet through WiFi, or by a wired connection?
Laser-type printers, like yours, usually don't mind being turned Off for a while.
But, if anything about your network has changed in the last couple of months, then the printer may be not-printing simply because network addresses have changed.
So, have you reinstalled the drivers for the printer since three months ago? you might have to do so, unfortunately, if you haven't done so already.
Go, on your computer, to the Canon software you installed with your printer's drivers. There should be a toner-level-checking function there.
Or, go to
View Devices and Printers
and find your printer's icon there. Right-click on that icon,
and select Properties.
See if there is a Maintenance tab on the Properties. If so, that tab should have a Toner Level or Check Toner Level function in it.
Also the printer itself *might* have such a function on it, itself, though I haven't checked on that possibility yet.