Canon Mp630 problem- " printing " only white papers :)

[iusty]

My printer is "printing" white papers, no mather if i scan or print them from a computer, they exit white.

The cartriges are origial, and the ink is getting out of them but not on paper.

I have no ideea what could it be, i washed the printhead ( the soket where all cartriges go in ) , whit no effect.

Please help !