My printer has a very strange problem. When it prints something,
everithing is Ok, but there is nothing printed on a paper at the end!!
Paper come in, printer is making noises like in normal days, but paper
is coming out clean white. Cartidges are new, so the colour is. Thi is
strange.

have you ever printed normal with this cartriges or you just mount
them? check if you removed all the "stickers", the new out-of-box
cartige may have a plastic cover to protect it from drying.. if its
like HPs cartrige, with contacts on the cartrige and on the printer,
try to clean them. at all it aways could be a defective cartrige.. but
you said it does not print at all, not color, nor black.. so i doub you
have such a luck - 2 defective cartr..