I have an HP Color Laserjet CP2020 printer that has been giving me problems. I am attaching images of four pages I recently printed. The first two show black streaks along the edges when I printed test pages. The third one shows what I have been getting when printing a text document with just black print. I changed the black toner and the 4th one show what began after about 10 pages of clean printing. Please advise as to what may be wrong with this printer. Thank you!