My epson workforce 600 is giving me a warning message of "Close Scanner Unit Firmly" when I try to print a document or do a head alignment. It will print lined paper and a head cleaning sheet. (The one with the 2 black columns and then one each of the other 3 colors that contain lines.) This printer has worked great up until a screw got dropped in the paper feed tray. The screw has been removed but I am a fraid it may have damaged something. Any suggestions?