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

At first glance, this appeared to be a good buy considering the cost of the original HP cartridges. I ordered 2 twin packs. After installing the first twin pack, I ran the cartridge alignment routine for my printer, and found there was no Yellow ink. I ran the prime routine. Still no Yellow. So I removed this color cartridge and installed the color cartridge from the SECOND twin pack. All seemed well. Ran same routines and everything was fine. But the day after this, the BLACK cartridge stopped working. As I had already shipped back the first twin pack for a refund, I had no other "new" black from my order. I was lucky I already had one new original HP black cartridge of my own which I installed, and it is working fine. I will NEVER buy this product again. There is NO bargain if the units do not work!