HP Color LaserJet 1600 Printer turns paper grey

Question

I bought this printer new and shortly after I purchased it, every page that I print turns a light grey. When I use cardstock, the printer makes the paper like like a sheet of marble. I have changed tones, but with the same results. I have contacted HP, but they said that they have never had this problem reported and told me to take it to an HP repair shop. I take it in a HP authorized printer repair shop, but they could not find any answers to the problem.