I removed the top and sides. I didn't really do anything to the printer. How it all started was it had been sitting doing nothing for a week or two so I was going to run a nozzle check and print something to keep it open. I asked it to start and it went through a bunch of noise like they do when they're getting everything ready, then it just stopped. I was doing something else and didn't pay attention to anything other than it had powered off. I started it again, same thing over, and maybe again and then it wouldn't come on at all. I took the top and sides off to get the carts and print head out and then put it back together. I didn't see any pieces fall off or anything. I took the sides and top off again when I started checking the gears as instructed further up this thread. Now with the printhead installed, and using your ps, it won't power on at all. It would still come on with the old ps. I guess it wasn't bad, after all. But now, it sits there and glares at me. I get error B200 on the screen.