I bought one of these a few years ago and recently tried to change the cartridges (for new branded ones) and the printer now doesn't recognize the cartridges. Strange how the old ones worked yet the new ones don't. So, I did a little research and found a few articles explaining (possibly) why.
I don't print much so I had the cartridges inside the printer for nearly a year, printing every now and again. Then I got a constant message on the display saying that ink levels were low. Being the frugal type, I didn't notice any loss in quality to the printouts so I waited until they'd completely run out. Big mistake.
Apparently, Lexmark cartridges have a chip in them which can put the printer out of action, permanently. If you don't replace them when you get the warning (within a certain time I guess) they can send a message to stop your printer from working. Any new cartridges inserted will get the error message 'Invalid', even if you put back in your old working cartridges, they will display as 'invalid' also.
Why is this? Probably to force you to buy a new printer, thinking your printer is broken, who knows? It's seems a really stupid thing to do as if I was going to buy a new printer, it wouldn't be another Lexmark. Even if this is not true, it calls into question Lexmark build quality. Support ran me through loads of trouble shooting steps (pull power brick out of back, wipe cartridge connections, etc) but I think they knew what my problem was but couldn't tell me directly, wasting both of our times. No wonder this product is discontinued, I only hope their newer products don't have the same problem. I'd rather not risk it.
I for one won't be buying any more Lexmark products. Just search by Most Popular or Highest Reviews, you won't find a Lexmark product. I'll be going back to Epson/Canon for my new printer.