When I look at Printer Properties/Ports I note that USB001 has been assigned, and that USB001/HP LaserJet 3050 PCL5 appears in the Ports list TWICE! This is precisely what "HP Universal Printer PCL6" was doing when it had hung the print spooler. Sending a Print Test Page does not print anything, nor does it cause an error message. Then I reinstalled the printer "HP LaserJet 3050 PCL5". After this, my other printers began to work. That I could remove all experimental printers and print drivers. It wasn't until I came across this in an internet search:
The "hung" spooler was also causing lights to flash on my HP Deskjet D4360. I had tried installing and using so many print drivers that I had "hung" the print spooler - Windows prevented me from deleting printer "HP Universal Printer PCL6" and its driver.
Printing Errors or Lights & Stuck Print Jobs.Notebook Hardware and Upgrade Questions.
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