said by Dustyn:
That happened to me too.
• Turn the printer off/on.
• Disconnect then reconnect the USB connection while the printer is ON.
• Delete the HP LaserJet 6L from Device Manager, then rescan for hardware changes to have Windows re-identify and refresh the drivers.
• Delete the printer from Device Manager and try adding it and configuring it manually choosing the port it's on and other options.
Already tried the first two steps without success. Will try the other two and hope for a good outcome.