I received a frantic call from a client just the other day.  He had just returned from a trip and had not used his computer in three weeks.  He told me he was able to print out the contents of an email, but when he tried to print the attached PDF file, nothing happened.

I went to see this for myself, because I could not understand what was wrong.  Sure enough, nothing happened when I tried to print the PDF file; not a flicker, not an hourglass, and nothing in the print queue.

I approached diagnosing the problem in a logical manner.  I restarted the printers (there were two – and neither one worked), rebooted the computer, and tried to print the PDF file.  Still nothing.
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