Hi! 
I'm struggling with creating a field validation rule that requires multiple fields to be not blank if anyone moves the lead from "Unqualified" to "MQL".  I've cobbled the below together from a similar Opportunity validation rule but it does not work:

AND (
ISPICKVAL(Status, "MQL"),
ISPICKVAL(PRIORVALUE(Status), "Unqualified"),
NOT(ISBLANK(State)) 
NOT(ISBLANK(Industry))
)

Can anyone show me what I'm doing wrong?