My super reliable Dell C1760NW has thrown a wobbly this week. It didn't seem to like the latest aftermarket, (used the same ones from Amazon for years), cyan toner cart. Then it said the Black cart needed replacing and even with a clean and reload didn't like it. It's says it's empty, but I only changed it 2 months ago and they last a year on our usual consumption. Not sure whether to try other carts from Amazon or try to get these replaced. Anyone else had any C1760NW problems? I now they were popular when they were on special a few years back.