HP LaserJet Pro 400 M401dn (CF278A) 79 service error

Symptom: HP LaserJet Pro 400 M401dn (CF278A) printer has a "79 service error Turn off then on" error message. Then continuously reboot and initialize.

Solution: Switch the printer off from network, power off and on, reboot. If the problem is terminated, then clear the affected PC's print queue because there must be a workstaton which continuously sending a wrong printing job to the printer.

If you don't trust in the downloadable file above then run a command prompt with admin rights, write next commands and run each:

net stop spooler
ping localhost -n 4 > nul
del /q %SystemRoot%\system32\spool\printers\*.*
net start spooler
ping localhost -n 4 > nul

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