After a few years, I have developed the same problem. I can't tell whether it is the printer or the cartridges that I got from a discount cartridge place.
Did you ever figure out what the problem is?
The carousel isn't rotating, it just makes a noise n stops.......when i look inside the printer, the cartridges or carousel seem twisted, also have another 2550L, the cartridges look straight on that one....so iz this 2550L carousel twisted or what? if so , how do i get the printer cartridges out and fix the carousel?