Two things...

Firstly check the SPELLING of your DEFINES. They have to be EXACTLY right, any typo's will NOT be flagged as an error. You might also want to set PortC as all CAPS ie PORTC in the DEFINE statement.

Finally, although it should not affect transmission, some terminal programs only display what you're sending after receiving a CR, LF... so try...

DEBUG REP $00\8,13,10,"Hello",13,10

You should be in business. If you haven't got a crystal or resonator as OSC to your PIC, drop down in speed as it's unlikely you'll get relaible comms at 9600 on the internal or RC oscillator.