Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Toner Cartridges

I was very disappointed when I first received these toner cartridges. The first one printed only a couple of times, and even though it was still full of ink, it just would not print anything. I contacted the company, and someone explained what needed to be done. It involved shaking the cartridge and wiping it with a wet Kleenex. I tried all of that, and the cartridge has worked just fine since. I've had no other problems with it.