OS X Mavericks :: Printer Won't Work Despite Reset

My newish Canon LBP 6000 printer periodically stops working. I've always managed to get it going again by reinstalling it. This time, nothing I do is working. Here is a screen shot of what I get.

When I try to print, (first window, top left), the "sending data to printer" message goes on endlessly. I tried unplugging the printer USB from the computer, and then got the second window ("the printer is not connected"/"the printer is offline"). If I try to get supply levels, through System Utilities, the information is not available. Does that mean the computer can't read/send data to the printer? When I try to open Printer Utility, I get the "Printer Error" message (last window) saying "there are no registered printers. Add a printer..." But I've added the printer several times, after downloading the proper software.

I reset the printer system. When I added the printer back on, it came up with the old information:

P.S. From the first time I set up the printer, about a year ago, it always took much longer to read a document and start printing than our almost identical printer at work. That one invariably starts printing (on a PC) within 2 or 3 seconds; mine, on the Mac, takes at least12, often more.

Info:
Mac OS X (10.5.8)