Programme stuck in setup

Thanks for the quick replies guys!

When I open up the serial monitor I get something like this:

Into Setup
Into Setup
Into Setup
BMP complete
IntïR?½Setup
Into Setup
BMP complete
IntïR?½Setup
Into Setup
BMP complete
IntïR?½Setup
Into Setup
BMP complete
IntïR?½Setup
Into Setup
BMP complete
IntïR?½Setup
Into Setup
BMP complete
IntïR?½Setup

and it is repeated like that. I've tried matching the com rates but I get the same results. Should I try something else to debug it?