Hello, I have been having issues with my printer making an annoying grinding/screeching noise. Now I am getting greenish/yellowish blotches on the paper. I cannot seem to locate anything stuck in the printer. I previously called HP and she had me change my ink cartridge. The noise went away for a short while, but now it is worse than ever and I am not receiving any notification that an ink cartridge needs rep . Anyone know what the problem could be? Any suggestions would be helpful. Thank you.