Does anyone know how to test a printer cartridge? My HP printer, it's a 2175xi, keeps telling me to test my cartridges and won't let me do anything. No copies, no scans, obviously no prints. It won't even let me run the utility. I've replaced the cartridges with some used ones I had laying around with the same results. I really don't want to spend $50 dollars or more for new cartridges. The ones I have are not that old and still have ink in them. I weighed an empty one for comparison.