Well I just installed our new HP Photosmart 8450 printer. I decided to keep my Lexmark x75 installed too. The reason I did this is because I wanted a scanner and it’s a little cheaper to print on seeing as it only has 2 cartages. Anyway since the HP has been installed my Lexmark won't print. I can scan but I can't print. It says communication unavailable. I don't get it I tried everything I can this of. I have then both ran off USB slots. Please help