I bought a secondhand HP LaserJet 4000N in 2000.
It sat, untested, in its box, in my mother's garage for a year or so. It gets cold in there.
I moved into my current house in Nov 2001, installed the printer (with a brand-new HP cartridge that I bought off a well-known auction site) and it worked - brilliantly.
It has seen off 3 PCs, and earlier this year, with the latest one, it was networked for the first time. It still worked brilliantly.
Recently, I upgraded to Windows 7 and Windows found the correct driver and installed it. I assume that it's an HP driver, since I now get an unobtrusive popup with an HP logo that tells me it's doing what I asked it to do. It still works, brilliantly.
The original printer cartridge that I installed now tells me that it has low toner (1500 pages to go). A year or so, then, at a guess. I have a spare in the cupboard.
The thing is built like a tank and works.
Tick in box from the Gadget household.
Gadget 