HP Toner Compatibility (HP LaserJet 4, 4+, 5M, 5N) usable in HP 4050N?
We have substantial supply of old HP toner for listed LaserJets. Current printer is HP LJ 4050N. Is the toner itself compatible with the 4050N? (We realize the cartridges are not interchangeable.) If toner is usable, where can we get instructions for refilling 4050N toner cartridges?