My Canon MP530 just stopped ! It said it needed a cartridge to be changed. I took it out and .... it was EMPTY. I used to have an Epson printer. Well several actually. When it informed me that it was out of ink, I would take out the cartridge a shake it. The sloshing sound didn't sound empty. I am more than a little ticked at Epson for this. I couldn't be happier with the Canon.