Anne, Not to my knowledge. My first printer was a HP LaserJet which is still in use today, some 10+ years later. The first toner cartridge was in for about 5 years without any issues at all. That was a 5000 page toner if my memory is correct. I don't think toner has any issues like inkjets, apples and oranges. Brad Loomis San Miguel, CA -----Original Message----- Thanks to everyone who advised me, on this news group and by personal e-mail , about a good printer to buy. I've ended up with a Samsung ML-1740 laser which came with enough toner to print 1,000 copies. What I would like to know is this: Is there a longevity to toner as there is to ink jets that dry up on you? I've looked in the user manual and googled it, but the answers only address longevity as to how many copies a cartridge will make. I would like to know if toner ever becomes unusable because it will take me years to run 1,000 copies. Many, many thanks, Anne Neighbors Visit our website regularly for FAQs, articles, how-to's, tech tips and much more http://freepctech.com