Which version of Lightroom are you using?
Which operating system are you using?
Have you tried to print from any other application outside Adobe.
Have you made any changes to the printer drivers or on the computer resulting this issue?
I am using LR 5 with OS X 10.10.5/ I have used my other printer without any problems. In iPhoto the prints on my printer come out magenta. The color matching is set to my Canon Printer, not to Color Sync, the other choice. There have been no changes that I am aware of.
I also made a print with Color Sync selected and the print also came out magenta.