dell c1765nfw prints pink

My c1765nfw prints a pink stripe on one side of the page, and the rest of the printing is dominated by pink. All cartridges are DELL and are brand new. I've run all the usual diagnostic tests and none of the Dell support forum options work. I see several posts in this forum on this issue, but no solutions. Has anyone solved it yet? this is a fairly new printer - can't believe it is time to throw it out already.