I'm ignorant about Lexmark, so the following are generic questions. I infer the x1270 is a very entry level printer, perhaps with combined print-head + multi-color dye colors. I tried to check, but the Lexmark website seems down.
* Was the cartridge made by Lexmark with Lexmark OEM ink, or after-market?
* Purchased locally, so not a big deal to return? Or no-name from Amazon, eBay, etc.? If so, have you bought from them before?
* Can you tell if the cart has ink in it, or is it opaque? Can you weigh it?
* Did the printer work before?
* Have you purchased enough replacement cartridges to be pretty sure of what they are supposed to look like?
* Can you put the old cart in the printer, maybe over-ride the "Low / Empty" warning, and get it to print?
* What happens with a "nozzle check"?