5110cn is not printing correct color or crip lines

HI, 

I changed my black toner with a dell toner, since I did that, my colors bleed and nothing is crisp or correct.  There are no particular lines or anytthing else in the print.  Can someone please tell me where to look or what to change next. 

This is used for a small business so we need it asap!!!  THANK YOU!!!   Lisa  :emotion-9: