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I have the same problem and I know what is causing my problem. It's not in the cartridge. You're laser scanner is going to go bad. I had the problem 3 months ago. I would only make the grinding noise when it powered up. Printing was okay. I don't use the printer that much. Then about a week ago I notice only the bottom diagnostic light was on. I unplug the power and powered it back up. The grinding noise got louder and wouldn't stop. I unplugged the printer an replugged. Same thing.
I was bored (christmas day) and decided to open my printer to see what the root cause problem was. I removed several screws and once I got all the printer naked (removed all the plastic outside). I plugged it in an tried to listen where the problem was. I notice a vibration at the laser scanner (top black piece). I unplugged the printer. I unplugged the power source to the laser scanner. Replugged the power and saw all the gears move with no noise. Powered off. Replugged laser scanner. Powered on. Noise back. Defective laser scanner. The
laser scanner has a ribbon cable, and four purple wires going to it, oh
yeah there is a big yellow warning label, so you can't miss it. I hope
I would recommend that you perform a power cycle by unplugging the printer for 60 seconds then restarting your computer, logging back in....then plug your printer back into your computer, If that does not work I would also try going to www.hp.com clicking Software & Driver Downloads on your right corner of your browser of the HP website then typing in the product which is "Laserjet 1200" then choose your current operating system then download the full driver device.